The name Ján observes its name day in Slovakia annually on June 24.
Ján is the traditional Slavic iteration of the classic name John, derived from the Hebrew meaning “God is gracious.” Historically prevalent in regions like Slovakia and Czechia, the name maintains a strong connection to European heritage. In the USA, this specific spelling often signifies Central European ancestry, standing out amongst more common anglicized versions. Ján is consistently classified worldwide as a highly traditional masculine name. The mood associated with Ján is strong, classic, and grounded, suggesting stability and reliability. Its long history anchors its identity as an enduring, foundational staple.
| 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 |
| Poland | 10 | January | Agaton, Dobrosław, Jan, Nikanor, Paweł, Wilhelm |
 Spain | 11 | January | Alejandro, Guillermo, Hortensia, Higinia, Higinio, Modesto |
 Sweden | 11 | January | Jan, Jannike |
 Austria | 12 | January | Ernst, Tatjana, Xenia |
| Poland | 12 | January | Antoni, Arkadiusz, Arkady, Benedykt, Czech, Czechasz, Czechoń, Czesław, Czesława, Ernest, Ernestyn, Greta, Reinhold, Tycjan |
| Poland | 17 | January | Antoni, Jan, Rościsław |
| 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 | 23 | January | Emerencja, Ildefons, Jan, Klemens, Maria, Rajmund, Rajmunda, Wrócisława |
| 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 |
| Poland | 31 | January | Cyrus, Euzebiusz, Jan, Ksawery, Ludwik, Marceli, Marcelin, Marcelina, Piotr, Spycigniew, Wirgiliusz |
| Croatia | 2 | February | Marijan |
| 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 | 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 |
| Poland | 5 | March | Adrian, Adrianna, Fryderyk, Jan, Pakosław, Pakosz, Wacław, Wacława |
| Poland | 8 | March | Beata, Filemon, Jan, Julian, Miligost, Miłogost, Stefan, Wincenty |
| 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 |
| Poland | 17 | March | Gertruda, Harasym, Jan, Patrycjusz, Patryk, Regina, Rena, Zbigniew, Zbygniew, Zbyszko |
| Spain | 20 | March | Alejandra, Claudia |
| Croatia | 21 | March | Kristijan, Vesna, Vlasta |
| Poland | 27 | March | Benedykt, Ernest, Ernestyn, Jan, Lidia, Rościmir, Rupert |
| Spain | 27 | March | Ruperto, Lilia, Alejandro |
| Poland | 28 | March | Aniela, Antoni, Jan, Krzesisław, Sykstus |
| Poland | 30 | March | Amelia, Aniela, Częstobor, Jan, Kwiryn, Kwiryna |
 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 |
| Poland | 13 | April | Hermenegild, Hermenegilda, Ida, Jan, Justyn, Małgorzata, Przemysł, Przemysław |
| 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 |
| 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 |
| Latvia | 14 | May | Aiva, Duda, Elfa, Krisjanis, Kriss |
| Poland | 15 | May | Afanazy, Atanazy, Berta, Cecyliusz, Czcibora, Dionizja, Izydor, Jan, Nadzieja, Ruprecht, Strzeżysław, Zofia |
| 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 |
| 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 |
 Czechia | 24 | May | Jana |
| Poland | 24 | May | Cieszysława, Estera, Jan, Joanna, Maria, Mokij, Wincenty, Zula, Zuzanna |
| Poland | 27 | May | Beda, Izydor, Jan, Juliusz, Lucjan, Magdalena, Radowit |
| 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 | 12 | June | Antonina, Bazyli, Jan, Leon, Onufry, Wyszemir |
| Poland | 13 | June | Antoni, Chociemir, Herman, Lucjan, Maria Magdalena, Tobiasz |
| Poland | 16 | June | Alina, Aneta, Benon, Budzimir, Jan, Justyna, Ludgarda |
| Poland | 17 | June | Adolf, Adolfa, Adolfina, Agnieszka, Alf, Drogomysł, Franciszek, Laura, Marcjan, Radomił, Rainer, Wolmar |
| Croatia | 18 | June | Marko, Marcelijan, Ljubomir |
| Czechia | 24 | June | Jan |
| Estonia | 24 | June | Johannes, Johan, Juhan, Juho, Jaan, Jan, Kanek, Janno, Jukk, Juss, Hannes, Annes, Hans, Ants |
| Finland | 24 | June | Johannes, Juhani, Jussi, Jani, Janne, Juha, Juhana, Juho, Jukka |
| Latvia | 24 | June | Janis, Zanis |
| 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 |
| Hungary | 26 | June | János, Pál |
| Poland | 26 | June | Jan, Jeremi, Jeremiasz, Paweł, Zdziwoj |
| 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 |
| Poland | 9 | August | Jan, Klarysa, Miłorad, Roland, Roman, Romuald |
| Croatia | 13 | August | Poncijan, Hipolit, Ivan Berchmans |
| Poland | 13 | August | Diana, Dianna, Gertruda, Helena, Hipolit, Hipolita, Jan, Kasjan, Radomiła, Wojbor |
| Croatia | 14 | August | Maksimilijan Kolbe, Alfred |
| Estonia | 15 | August | Johanna, Hanna, Jaana, Jaanika, Jana, Janika, Janne, Jenny, Nanna |
| Austria | 17 | August | Gudrun, Hyazinth, Janine |
| Poland | 19 | August | Bolesław, Emilia, Jan, Julian, Juliusz, Ludwik, Piotr, Sebald |
| Poland | 20 | August | Bernard, Jan, Sabin, Samuel, Samuela, Sieciech, Sobiesław, Świeciech, Szwieciech |
| 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 |
| 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 |
| 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 |
| Norway | 24 | September | Jan, Jens |
| Croatia | 26 | September | Kuzma, Damjan, Damir |
| 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 |
| Croatia | 3 | October | Kandid, Maksimilijan, Evald |
| Croatia | 5 | October | Rajmund of Capua, Flavijan, Miodrag |
| Poland | 9 | October | Arnold, Arnolf, Atanazja, Bogdan, Dionizjusz, Dionizy, Jan, Ludwik, Przedpełk |
| Croatia | 11 | October | Emilijan, Bruno K. |
| Poland | 20 | October | Budzisława, Irena, Jan Kanty, Kleopatra, Wendelin, Witalis |
| Poland | 23 | October | Iga, Ignacja, Ignacy, Jan, Marlena, Odilla, Roman, Seweryn, Teodor, Włościsław, Żegota |
| Poland | 26 | October | Dymitriusz, Ewaryst, Eweryst, Łucjan, Lucyna, Ludmiła, Lutosław |
| Estonia | 13 | November | Kristjan, Krister, Kristo, Risto |
| Poland | 13 | November | Arkadiusz, Arkady, Brykcjusz, Eugeniusz, Jan, Mikołaj, Stanisław, Walentyn |
| 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 |
| 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 |
| 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 |
| Poland | 27 | December | Cezary, Fabia, Fabiola, Jan, Radomysł |