Dan has name days on January 3, February 16, June 24, and October 1 in Poland; October 10 in the USA; December 11 in Greece and Norway.
Dan is a widely recognized name, primarily used for males, with roots in the Hebrew name Daniel. It gained prominence in the United States during the mid-20th century and remains a familiar choice today, though its popularity has slightly decreased. Variations of Dan are common throughout Northern and Eastern Europe, particularly in Scandinavian countries and Poland. The name’s simplicity and strong sound contribute to its broad appeal. It evokes a sense of dependability and straightforwardness, suggesting a reliable and honest personality. Its historical development reflects a natural evolution of naming conventions, stemming from shortened forms of longer names.
| Country | Day | Month | Names |
 Ukraine | 1 | January | Basil, Bohdan, David, Vasylyna |
 Slovakia | 3 | January | Daniela |
 Spain | 3 | January | Daniel, Genova, Genoveva, Jennifer, Florencio, Prisciliano |
 USA | 4 | January | Angel, Angela, Angelica, Angelina, Angeline, Angelique, Angelo, Angie, Dangelo, Deangelo, Lewis, Lou, Louie, Louis, Luis |
 Bulgaria | 6 | January | Bogomil, Bogdan, Bogdana, Bozhidar, Bozhidara, Borislav, Borislava, Jordan, Yordan, Yordanka, Nayden, Teodosii |
 Greece | 6 | January | Theofania, Theofanis, Fani, Fannoula, Fotis, Fotini, Jordan, Ourania |
 Czechia | 9 | January | Vladan |
| Bulgaria | 11 | January | Bogdan, Bogdana, Bogomil, Bogomila, Teodosii |
| Czechia | 11 | January | Bohdana |
| Slovakia | 18 | January | Bohdana |
 Croatia | 30 | January | Martina, Tina, Gordana |
 Poland | 6 | February | Angel, Angelus, Antoni, Bogdana, Bohdan, Bohdana, Dorota, Ksenia, Szymon, Tytus |
| Spain | 11 | February | Dante, Lourdes, Adolfo |
| Croatia | 13 | February | Jordan, Božidar, Božica |
| Poland | 13 | February | Benigna, Grzegorz, Jordan, Kastor, Katarzyna, Klemens, Toligniew |
 France | 15 | February | Claude, Georgina, Jordan |
| Poland | 15 | February | Faustyn, Georgia, Georgina, Jordan, Jowita, Józef, Klaudiusz, Przybyrad, Sewer |
 Denmark | 17 | February | Findanus |
| USA | 17 | February | Jordan, Jordana, Jordanne, Jorden, Jordon, Jordyn, Leroy, Reggie, Reginald, Regis, Rex, Rexanna, Rexford, Rexine, Roy, Royce |
| Croatia | 22 | February | Grozdan |
| Croatia | 6 | March | Koleta, Zvjezdana, Viktor |
| Poland | 6 | March | Eugenia, Felicyta, Frydolin, Jordan, Klaudian, Koleta, Róża, Wiktor, Wiktoriusz, Wojsław |
| Bulgaria | 7 | March | Bozhan, Bozhidar, Bozhidara, Bozhil, Bozhko, Emanuil, Manol, Mancho, Teodor, Teodora, Toto, Todor, Teodor, Todora, Dora, Bogdan, Bogdana |
| Poland | 19 | March | Bogdan, Józef |
 Latvia | 8 | April | Dana, Danute, Dziedra, Edgars, Zanete |
| Poland | 10 | April | Antoni, Apoloniusz, Daniel, Ezechiel, Grodzisław, Henryk, Makary, Małgorzata, Michał, Pompejusz |
| Slovakia | 16 | April | Dana, Danica |
| Latvia | 18 | April | Dana, Hildegarde, Jadviga, Laura, Nameisis |
| Denmark | 19 | April | Daniel |
 Italy | 22 | April | Daniele |
| Bulgaria | 2 | May | Boriana, Boris, Borislav, Borislava, Boryana, Zhivko, Zhivka, Zhivodan |
 Lithuania | 7 | May | Butautas, Danute, Rimte, Stanislovas, Stasys |
| France | 16 | May | Brendan, Honoré |
| USA | 16 | May | Brand, Branden, Brandi, Brandon, Brandy, Brannon, Brant, Brenda, Brendan, Brenden, Brendon, Brenna, Brennan, Brent, Brenton |
| Lithuania | 25 | May | Almantas, Danute, Urbonas |
| USA | 6 | June | Dante, Donte, Delaney, Norbert, Norberta, Norberto |
| Greece | 9 | June | Rodanthi |
| Ukraine | 4 | July | Bohdanna |
| Poland | 15 | July | Daniel, Dawid, Dawida, Egon, Henryk, Iga, Ignacja, Ignacy, Lubomysł, Niecisław, Włodzimierz, Żegota |
| Lithuania | 16 | July | Danguole, Faustas, Vaigaudas |
| Poland | 17 | July | Aleksander, Aleksy, Andrzej, Bogdan, Dzierżykraj, Januaria, Julietta, Leon, Marceli, Marcelina, Maria Magdalena |
 Austria | 21 | July | Daniel, Daniela, Julia, Laurentius |
| Croatia | 21 | July | Danijel prorok, Lovro Brindiški, Danica |
 Germany | 21 | July | Daniel |
 Hungary | 21 | July | Dániel, Daniella |
| Latvia | 21 | July | Dabris, Daniels, Meldra, Melisa |
| Lithuania | 21 | July | Danielius, Lionginas, Rimvydas, Rimvyde |
| Poland | 21 | July | Andrzej, Benedykt, Daniel, Paulina, Prakseda, Prokop, Stojsław, Wiktor, Wiktoriusz |
| Slovakia | 21 | July | Daniel |
| Spain | 21 | July | Angelina, Angelines, Lorenza, Daniel, Julia |
| Croatia | 23 | July | Brigita Švedska, Ivan Cassian, Slobodan |
| Poland | 10 | August | Asteria, Bernard, Bogdan, Borys, Filomena, Laurencjusz, Prochor, Wawrzyniec, Wierzchosław |
| Croatia | 17 | August | Hijacint Poljak, Slobodan |
| Poland | 31 | August | Bohdan, Paulina, Rajmund, Rajmunda, Świętosław |
| USA | 31 | August | Aden, Aidan, Aiden, Ayden, Edan, Edana, Eden, Edina, Egan, Egon |
| Poland | 2 | September | Absalon, Bohdan, Czech, Czechasz, Czechoń, Czesław, Dersław, Dionizy, Eliza, Henryk, Julian, Stefan, Tobiasz, Wilhelm, Witomysł |
| Czechia | 9 | September | Daniela |
 Romania | 5 | October | Daniil, Haritina, Misail |
| Poland | 9 | October | Arnold, Arnolf, Atanazja, Bogdan, Dionizjusz, Dionizy, Jan, Ludwik, Przedpełk |
| Croatia | 10 | October | Franjo Borgija, Danijel, Danko |
| Italy | 10 | October | Daniele |
| Lithuania | 10 | October | Butaute, Danielius, Gilvydas |
| Poland | 13 | October | Daniel, Edward, Gerald, Geraldyna, Maurycy, Mikołaj, Siemisław, Teofil |
| Croatia | 27 | October | Sabina Avil., Gordana, Cvitko |
| Poland | 2 | November | Ambroży, Bohdana, Bożydar, Eudoksjusz, Małgorzata, Stojmir, Tobiasz, Wiktoryn |
| Lithuania | 5 | November | Audangas, Elzbieta, Elze, Florijonas, Gedvyde |
| Croatia | 8 | November | Gracija Kotorski, Milotislav, Bogdan |
| Czechia | 9 | November | Bohdan |
 Norway | 20 | November | Halvdan, Helle |
| USA | 30 | November | Anderson, Andra, Andre, Andrea, Andreas, Andres, Andrew, Andria, Andy, Dandre, Deandre |
| Poland | 10 | December | Andrzej, Daniel, Judyta, Julia, Maria, Radzisława |
| Czechia | 11 | December | Dana |
 Finland | 11 | December | Taneli, Tatu, Daniel, Daniela |
| France | 11 | December | Daniel |
| Poland | 11 | December | Damazy, Daniela, Julia, Stefan, Waldemar, Wojmir |
| Romania | 11 | December | Daniil, Luca |
 Sweden | 11 | December | Daniel, Daniela |
| Czechia | 15 | December | Radana, Radan |
| Bulgaria | 17 | December | Dana, Danail, Danaila, Daniela, Danko |
| Czechia | 17 | December | Daniel |
| Greece | 17 | December | Daniel, Dionisios |
| Romania | 17 | December | Daniel |
| Ukraine | 17 | December | Daniel |
| Romania | 18 | December | Daniil |
| Slovakia | 21 | December | Bohdan |
| USA | 24 | December | Adan, Adana, Adam, Adamina, Addison, Ava, Eva, Eve, Evelyn |