January in Poland features a diverse array of name days, encompassing both traditional Polish and widely recognized Christian names. Several names are celebrated multiple times across the month, with Piotr, Jan, and Julian appearing most frequently. Antoni, Izydor, Paweł, and Feliks are also recurring choices, reflecting their enduring popularity. Specific days, such as January 4th, 12th, and 28th, are particularly rich in nameday celebrations for numerous individuals. This comprehensive list offers an insightful look into the cultural practice of name day observances during the first month of the year.
| Country | Day | Month | Names |
 Poland | 1 | January | Masław, Mieczysław, Mieczysława, Mieszko |
| Poland | 2 | January | Abel, Izydor, Makary, Odil, Strzeżysław |
| Poland | 3 | January | Arletta, Dan, Danisz, Danuta, Enoch, Genowefa, Piotr, Włościsława |
| Poland | 4 | January | Angelika, Aniela, Benedykta, Benita, Dobromir, Dobrymir, Eugeniusz, Grzegorz, Izabela, Leonia, Rygobert, Tytus |
| Poland | 5 | January | Edward, Emilian, Emiliusz, Hanna, Symeon, Szymon, Telesfor, Włościbor |
| Poland | 6 | January | Andrzej, Balcer, Baltazar, Bolemir, Epifania, Kacper, Kasper, Melchior |
| Poland | 7 | January | Chociesław, Izydor, Julian, Lucjan, Walenty |
| Poland | 8 | January | Erhard, Mścisław, Seweryn |
| Poland | 9 | January | Antoni, Bazylissa, Borzymir, Julian, Julianna, Marcelina, Marcjanna |
| Poland | 10 | January | Agaton, Dobrosław, Jan, Nikanor, Paweł, Wilhelm |
| Poland | 11 | January | Feliks, Hilary, Honorata, Hygin, Krzesimir, Matylda, Mechtylda |
| Poland | 12 | January | Antoni, Arkadiusz, Arkady, Benedykt, Czech, Czechasz, Czechoń, Czesław, Czesława, Ernest, Ernestyn, Greta, Reinhold, Tycjan |
| Poland | 13 | January | Bogumił, Bogusąd, Bogusława, Godfryd, Gotfryd, Leoncjusz, Melania, Weronika |
| Poland | 14 | January | Feliks, Hilary, Odo, Radogost |
| Poland | 15 | January | Aleksander, Dąbrówka, Dobrawa, Domasław, Domosław, Izydor, Makary, Maur, Paweł |
| Poland | 16 | January | Marcel, Waleriusz, Włodzimierz |
| Poland | 17 | January | Antoni, Jan, Rościsław |
| Poland | 18 | January | Bogumił, Jaropełk, Krystyna, Liberata, Małgorzata, Piotr, Pryska |
| Poland | 19 | January | Andrzej, Bernard, Erwin, Erwina, Eufemia, Henryk, Kanut, Mariusz, Marta, Matylda, Mechtylda, Pia, Racimir, Sara |
| Poland | 20 | January | Dobiegniew, Fabian, Sebastian |
| Poland | 21 | January | Agnieszka, Epifani, Jarosław, Jarosława, Jerosława, Marcela |
| Poland | 22 | January | Anastazy, Dobromysł, Gaudencjusz, Gaudenty, Marta, Wincenty |
| Poland | 23 | January | Emerencja, Ildefons, Jan, Klemens, Maria, Rajmund, Rajmunda, Wrócisława |
| Poland | 24 | January | Chwalibóg, Felicja, Mirogniew, Rafaela, Rafał, Tymoteusz |
| Poland | 25 | January | Miłosz, Miłowan, Miłowit, Paweł, Tacjanna, Tatiana |
| Poland | 26 | January | Paula, Paulina, Polikarp, Skarbimir, Wanda |
| Poland | 27 | January | Angelika, Ilona, Jan Chryzostom, Julian, Przybysław |
| Poland | 28 | January | Agnieszka, Augustyn, Flawian, Ildefons, Julian, Karol, Leonidas, Piotr, Radomir, Roger, Waleriusz |
| Poland | 29 | January | Franciszek Salezy, Gilda, Hanna, Walerian, Waleriana, Waleriusz, Zdzisław |
| Poland | 30 | January | Adelajda, Feliks, Gerard, Gerarda, Gerhard, Hiacynta, Maciej, Marcin, Martyna, Sebastian |
| Poland | 31 | January | Cyrus, Euzebiusz, Jan, Ksawery, Ludwik, Marceli, Marcelin, Marcelina, Piotr, Spycigniew, Wirgiliusz |
