| 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 |
