Jan's name day is celebrated numerous times annually across several countries, reflecting its vast European popularity. Poland observes the name day on over thirty dates, encompassing every single month of the year except for July. Other European countries also commemorate the name, with specific dates noted in Sweden on January 11, Czechia and Estonia on June 24, Norway on September 24, and Austria on December 2. The June 24th date, which often aligns with the summer solstice, is also specifically recognized in the USA and Slovakia. These multiple commemorations strongly highlight the name's broad regional appeal and historical ecclesiastical importance across the globe.
Jan is a traditionally strong name derived from the ancient Hebrew root meaning "God has favored" or "Yahweh is gracious." This name serves as the ubiquitous European cognate of John, carrying deep historical significance particularly in Slavic and Germanic cultures. Within the USA, Jan has been primarily utilized by families seeking to maintain cultural ties to these European regions, though it remains relatively uncommon overall. The name conveys a mood that is robust, classic, and minimalist, rooted in intellectual clarity and reserved confidence. Gender classification for Jan is complex; it is overwhelmingly masculine across Europe but occasionally functions as a feminine short form in English-speaking countries. Its brevity and history ensure its status as a sophisticated, traditional choice.
| Country | Day | Month | Names |
 Poland | 10 | January | Agaton, Dobrosław, Jan, Nikanor, Paweł, Wilhelm |
 Sweden | 11 | January | Jan, Jannike |
| Poland | 17 | January | Antoni, Jan, Rościsław |
| Poland | 23 | January | Emerencja, Ildefons, Jan, Klemens, Maria, Rajmund, Rajmunda, Wrócisława |
| Poland | 31 | January | Cyrus, Euzebiusz, Jan, Ksawery, Ludwik, Marceli, Marcelin, Marcelina, Piotr, Spycigniew, Wirgiliusz |
| Poland | 4 | February | Andrzej, Gilbert, Jan, Joanna, Józef, Mariusz, Weronika, Witosława |
| Poland | 5 | February | Adelajda, Aga, Agata, Albin, Izydor, Jakub, Jan, Justynian, Paweł, Piotr, Strzeżysława |
| Poland | 8 | February | Gniewomir, Gniewosz, Honorat, Jan, Ksenofont, Lucjusz, Paweł, Piotr, Salomon, Sebastian, Żaklina |
| Poland | 5 | March | Adrian, Adrianna, Fryderyk, Jan, Pakosław, Pakosz, Wacław, Wacława |
| Poland | 8 | March | Beata, Filemon, Jan, Julian, Miligost, Miłogost, Stefan, Wincenty |
| Poland | 17 | March | Gertruda, Harasym, Jan, Patrycjusz, Patryk, Regina, Rena, Zbigniew, Zbygniew, Zbyszko |
| Poland | 27 | March | Benedykt, Ernest, Ernestyn, Jan, Lidia, Rościmir, Rupert |
| Poland | 28 | March | Aniela, Antoni, Jan, Krzesisław, Sykstus |
| Poland | 30 | March | Amelia, Aniela, Częstobor, Jan, Kwiryn, Kwiryna |
| Poland | 13 | April | Hermenegild, Hermenegilda, Ida, Jan, Justyn, Małgorzata, Przemysł, Przemysław |
| Poland | 6 | May | Benedykta, Benita, Dytrych, Gościwit, Jan, Judyta, Jurand |
| Poland | 10 | May | Antonin, Częstomir, Izydor, Jan, Symeon, Wiktoryna |
| Poland | 12 | May | Domicela, Domicjan, Dominik, Epifani, Flawia, Jan, Jazon, Joanna, Pankracy, Wszemił |
| Poland | 15 | May | Afanazy, Atanazy, Berta, Cecyliusz, Czcibora, Dionizja, Izydor, Jan, Nadzieja, Ruprecht, Strzeżysław, Zofia |
| Poland | 21 | May | Donat, Donata, Jan, Kryspin, Przecława, Pudens, Tymoteusz, Walenty, Wiktor, Wiktoriusz |
| Poland | 22 | May | Emil, Helena, Jan, Julia, Krzesisława, Rita, Wiesław, Wiesława, Wisława |
| Poland | 23 | May | Budziwoj, Dezyderiusz, Dezydery, Emilia, Iwona, Jan, Leontyna, Michał, Symeon |
| Poland | 24 | May | Cieszysława, Estera, Jan, Joanna, Maria, Mokij, Wincenty, Zula, Zuzanna |
| Poland | 27 | May | Beda, Izydor, Jan, Juliusz, Lucjan, Magdalena, Radowit |
| Poland | 12 | June | Antonina, Bazyli, Jan, Leon, Onufry, Wyszemir |
| Poland | 16 | June | Alina, Aneta, Benon, Budzimir, Jan, Justyna, Ludgarda |
 Czechia | 24 | June | Jan |
 Estonia | 24 | June | Johannes, Johan, Juhan, Juho, Jaan, Jan, Kanek, Janno, Jukk, Juss, Hannes, Annes, Hans, Ants |
| Poland | 24 | June | Dan, Danisz, Danuta, Emilia, Jan, Wilhelm |
 USA | 24 | June | Hans, Giovanna, Giovanni, Ian, Ivan, Jan, Jana, Jean, Jeanette, Jeannette, Johan, John, Johnnie, Johnny, Juan, Juana, Juanita, Sean, Shana, Shane, Shanna, Yancy |
| Poland | 26 | June | Jan, Jeremi, Jeremiasz, Paweł, Zdziwoj |
| Poland | 9 | August | Jan, Klarysa, Miłorad, Roland, Roman, Romuald |
| Poland | 13 | August | Diana, Dianna, Gertruda, Helena, Hipolit, Hipolita, Jan, Kasjan, Radomiła, Wojbor |
| Poland | 19 | August | Bolesław, Emilia, Jan, Julian, Juliusz, Ludwik, Piotr, Sebald |
| Poland | 20 | August | Bernard, Jan, Sabin, Samuel, Samuela, Sieciech, Sobiesław, Świeciech, Szwieciech |
| Poland | 29 | August | Flora, Jan, Racibor, Sabina |
| Poland | 3 | September | Antoni, Bartłomiej, Bazylissa, Bronisław, Bronisz, Erazma, Eufemia, Eufrozyna, Izabela, Jan, Joachim, Joachima, Manswet, Mojmir, Szymon, Wincenty, Zenon, Zenona |
| Poland | 11 | September | Feliks, Jacek, Jan, Naczesław, Prot |
 Norway | 24 | September | Jan, Jens |
| Poland | 28 | September | Jan, Laurencjusz, Luba, Lubosza, Marek, Nikita, Salomon, Sylwin, Wacław, Wacława, Wawrzyniec, Więcesław |
| Poland | 1 | October | Benigna, Cieszysław, Dan, Danisz, Danuta, Igor, Jan, Remigiusz |
| Poland | 9 | October | Arnold, Arnolf, Atanazja, Bogdan, Dionizjusz, Dionizy, Jan, Ludwik, Przedpełk |
| Poland | 23 | October | Iga, Ignacja, Ignacy, Jan, Marlena, Odilla, Roman, Seweryn, Teodor, Włościsław, Żegota |
| Poland | 13 | November | Arkadiusz, Arkady, Brykcjusz, Eugeniusz, Jan, Mikołaj, Stanisław, Walentyn |
| Poland | 24 | November | Dobrosław, Emilia, Emma, Flora, Franciszek, Gerard, Gerarda, Gerhard, Jan, Mina, Pęcisław, Protazy |
| Poland | 26 | November | Delfin, Dobiemiest, Jan, Konrad, Konrada, Lechosław, Lechosława, Leonard, Sylwester |
 Austria | 2 | December | Bibiana, Jan, Lucius |
| Poland | 27 | December | Cezary, Fabia, Fabiola, Jan, Radomysł |
| Country | Day | Month | Names |
 Croatia | 5 | January | Emilijana, Radoslav, Miljenko |
| Croatia | 7 | January | Rajmund, Lucijan, Zorislav |
| Poland | 7 | January | Chociesław, Izydor, Julian, Lucjan, Walenty |
| Croatia | 9 | January | Julijan, Živko, Miodrag |
| Poland | 9 | January | Antoni, Bazylissa, Borzymir, Julian, Julianna, Marcelina, Marcjanna |
 Latvia | 10 | January | Dorisa, Karmena, Tatjana |
 Spain | 11 | January | Alejandro, Guillermo, Hortensia, Higinia, Higinio, Modesto |
| Austria | 12 | January | Ernst, Tatjana, Xenia |
| Poland | 12 | January | Antoni, Arkadiusz, Arkady, Benedykt, Czech, Czechasz, Czechoń, Czesław, Czesława, Ernest, Ernestyn, Greta, Reinhold, Tycjan |
| Croatia | 19 | January | Mario, Ljiljana, Marta |
| Croatia | 20 | January | Fabijan, Sebastijan |
| Croatia | 21 | January | Agneza, Janja, Neža |
| Croatia | 23 | January | Emerencijana, Ema, Vjera, Milko |
| Poland | 25 | January | Miłosz, Miłowan, Miłowit, Paweł, Tacjanna, Tatiana |
| Croatia | 27 | January | Angela, Vitalijan, Pribislav |
| Poland | 27 | January | Angelika, Ilona, Jan Chryzostom, Julian, Przybysław |
| Spain | 30 | January | Alejandro |
| Croatia | 2 | February | Marijan |
| Poland | 11 | February | Adolf, Adolfa, Adolfina, Alf, Bernadetta, Dezydery, Eufrozyna, Łazarz, Lucjan, Maria, Olgierd, Świętomira |
| Croatia | 12 | February | Reginald, Damjan, Eulalija |
| Croatia | 16 | February | Onezim, Julijana, Miljenko |
| Croatia | 18 | February | Angelico, Šimun, Flavijan, Gizela |
| Poland | 2 | March | Absalon, Franciszek, Halszka, Helena, Henryk, Januaria, Krzysztof, Lew, Michał, Paweł, Piotr, Radosław, Symplicjusz |
| USA | 3 | March | Alasdair, Alastair, Alec, Alejandra, Alejandro, Alex, Alexa, Alexander, Alexandra, Alexandria, Alexia, Alexis, Alexus, Ali, Alondra, Dale, Darnell, Lex, Lexi, Lexie, Lexus, Sandra, Sandy, Sasha, Xander, Zander |
 Hungary | 5 | March | Adorján, Adrián |
| Croatia | 10 | March | Emilijan, Emil, Krunoslav |
| Croatia | 12 | March | Bernard, Budislav, Maksimilijan |
| Poland | 13 | March | Bożena, Ernest, Ernestyn, Kasjan, Krystyna, Marek, Roderyk, Rodryg, Rodryk, Trzebisław |
| Croatia | 14 | March | Matilda, Miljana, Borka |
| Croatia | 16 | March | Hrvoje, Miljan |
| Spain | 20 | March | Alejandra, Claudia |
| Croatia | 21 | March | Kristijan, Vesna, Vlasta |
| Spain | 27 | March | Ruperto, Lilia, Alejandro |
 Denmark | 8 | April | Janus |
| Poland | 8 | April | Apolinary, Cezary, Cezaryna, Dionizy, Gawryła, January, Radosław, Sieciesława |
 Finland | 12 | April | Julia, Julius, Janna, Juliaana, Janni, Juulia, Juuli |
| Croatia | 14 | April | Valerijan, Maksim |
| Croatia | 20 | April | Janja, Marcijan |
| Norway | 21 | April | Jannike, Jeanette |
| Finland | 23 | April | Yrjö, Jyrki, Jyri, Jiri, Jori, Yrjänä |
| Spain | 3 | May | Juvenal, Violeta, Evencio, Teódulo, Alejandro, Estela, Felipe |
| Sweden | 3 | May | Jane, John |
| Croatia | 4 | May | Florijan, Cvjetko, Cvijeta |
| Poland | 4 | May | Florian, Grzegorz, January, Michał, Monika, Paulin, Strzeżywoj |
| Latvia | 14 | May | Aiva, Duda, Elfa, Krisjanis, Kriss |
| Poland | 16 | May | Andrzej, Honorat, Jan Nepomucen, Jędrzej, Szymon, Trzebomysł, Ubald, Wieńczysław, Wiktorian |
| Spain | 18 | May | Alejandra, Félix, Próspero |
| Poland | 19 | May | Augustyn, Celestyn, Iwo, Mikołaj, Pękosław, Piotr, Potencjana |
| Czechia | 24 | May | Jana |
| Spain | 29 | May | Alejandro, Justo, Teodosia |
| Hungary | 30 | May | Janka, Zsanett |
| Poland | 1 | June | Alfons, Alfonsyna, Bernard, Fortunat, Gracjana, Hortensjusz, Jakub, Konrad, Konrada, Magdalena, Nikodem, Świętopełk, Symeon |
| Poland | 4 | June | Bazyliusz, Dacjan, Franciszek, Gościmił, Karol, Karp |
| Croatia | 8 | June | Dijana, Cecilija, Medardo, Vilim |
| Estonia | 9 | June | Haljand, Hallar, Hellar, Helar, Helari, Elar |
| Poland | 9 | June | Felicjan, Pelagia, Pelagiusz |
| Croatia | 10 | June | Margareta, Dijana, Bl. Ivan Dominici |
| Poland | 13 | June | Antoni, Chociemir, Herman, Lucjan, Maria Magdalena, Tobiasz |
| Poland | 17 | June | Adolf, Adolfa, Adolfina, Agnieszka, Alf, Drogomysł, Franciszek, Laura, Marcjan, Radomił, Rainer, Wolmar |
| Croatia | 18 | June | Marko, Marcelijan, Ljubomir |
| Finland | 24 | June | Johannes, Juhani, Jussi, Jani, Janne, Juha, Juhana, Juho, Jukka |
| Latvia | 24 | June | Janis, Zanis |
 Slovakia | 24 | June | Ján |
| Hungary | 26 | June | János, Pál |
| Croatia | 28 | June | Irenej, Smiljan |
| Norway | 9 | July | Gøran, Jøran, Ørjan |
| Sweden | 9 | July | Jörgen, Örjan |
| Poland | 10 | July | Aleksander, Amelia, Aniela, Filip, January, Radziwoj, Rufina, Samson, Sylwan, Sylwana, Witalis |
| Poland | 12 | July | Andrzej, Euzebiusz, Feliks, Henryk, Jan Gwalbert, Paweł, Piotr, Tolimir, Weronika |
| Poland | 17 | July | Aleksander, Aleksy, Andrzej, Bogdan, Dzierżykraj, Januaria, Julietta, Leon, Marceli, Marcelina, Maria Magdalena |
| Poland | 18 | July | Arnold, Arnolf, Erwin, Erwina, Kamil, Karolina, Robert, Roberta, Szymon, Unisław, Wespazjan |
| Croatia | 20 | July | Ilija prorok, Ilijana |
| Norway | 21 | July | Jane, Janne, Johanne |
| Croatia | 24 | July | Kristina Bols., Mirjana |
| Croatia | 4 | August | Ivan M. Vianney, Ivica, Tertulijan |
| Poland | 6 | August | Felicysym, Jakub, January, Sława, Stefan, Sykstus, Wincenty |
| Croatia | 13 | August | Poncijan, Hipolit, Ivan Berchmans |
| Croatia | 14 | August | Maksimilijan Kolbe, Alfred |
| Estonia | 15 | August | Johanna, Hanna, Jaana, Jaanika, Jana, Janika, Janne, Jenny, Nanna |
| Austria | 17 | August | Gudrun, Hyazinth, Janine |
| Latvia | 21 | August | Janina, Linda, Sidnejs |
| Slovakia | 21 | August | Jana |
| USA | 21 | August | Gianna, Jane, Janelle, Janessa, Janet, Janette, Janice, Janie, Janine, Janiya, Jayne, Shanice, Sheena |
| Poland | 22 | August | Cezary, Dalegor, Fabrycjan, Fabrycy, Hipolit, Hipolita, Maria, Namysław, Oswald, Oswalda, Tymoteusz, Zygfryd |
| Croatia | 16 | September | Kornelije, Cipirijan |
| Austria | 19 | September | Igor, Januarius |
| Croatia | 19 | September | Januarije, Emilija |
| Poland | 19 | September | Alfons, Alfonsyna, January, Konstancja, Sydonia, Teodor, Więcemir |
| Croatia | 26 | September | Kuzma, Damjan, Damir |
| Croatia | 3 | October | Kandid, Maksimilijan, Evald |
| Croatia | 5 | October | Rajmund of Capua, Flavijan, Miodrag |
| Croatia | 11 | October | Emilijan, Bruno K. |
| Poland | 20 | October | Budzisława, Irena, Jan Kanty, Kleopatra, Wendelin, Witalis |
| Poland | 26 | October | Dymitriusz, Ewaryst, Eweryst, Łucjan, Lucyna, Ludmiła, Lutosław |
| Estonia | 13 | November | Kristjan, Krister, Kristo, Risto |
| Finland | 15 | November | Janina, Janika, Janita, Janette |
| Croatia | 19 | November | Janja Asiška, Matilda, Krispin |
| Poland | 21 | November | Albert, Alberta, Albertyna, Janusz, Konrad, Konrada, Maria, Piotr, Regina, Rena, Rufus, Twardosław, Wiesław |
| Croatia | 2 | December | Bibijana, Blanka |
| Poland | 3 | December | Franciszek, Kasjan, Ksawery, Lucjusz, Unimir |
| Latvia | 15 | December | Jana, Johanna |
| Croatia | 16 | December | Lazar, Izak, Jolanda, Florijan |
| Croatia | 17 | December | Gacijan, Bosiljko, Rufo, Dražen |
| Poland | 18 | December | Bogusław, Gracjan, Gracjana, Laurencja, Wilibald, Wszemir |
| Croatia | 26 | December | Ivan ev., Ivo, Janko |
| Hungary | 27 | December | János |