Dan's name day is observed on multiple dates throughout the year, including January 3, February 16, June 24, and October 1 in Poland. Further celebrations occur on October 10 in the USA, and December 11 in both Greece and Norway.
Dan is recognized in the USA both as a standalone name and the common diminutive of the classical masculine name Daniel. Originating from Hebrew, the name carries the potent theological meaning “God is my judge.” Its history in the American naming landscape saw its highest frequency during the mid-20th century, cementing its status as a traditional choice. The name is strongly associated with male identity and is classified overwhelmingly as a masculine name globally. It projects a mood that is simple, strong, and highly reliable, suggesting a straightforward personality. This combination of historical depth and modern simplicity ensures its continued relevance.
| 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 |
| 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 |
 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 |
| Ukraine | 17 | December | Daniel |
| Slovakia | 21 | December | Bohdan |
| USA | 24 | December | Adan, Adana, Adam, Adamina, Addison, Ava, Eva, Eve, Evelyn |