Sebastian: Name day
Name Day List: Sebastian
| Country | Day | Month | Names |
 Austria | 20 | January | Fabianus, Sebastian, Ursula, Ute |
 Denmark | 20 | January | Fabian, Sebastian |
 Finland | 20 | January | Sebastian |
 Germany | 20 | January | Fabian, Paula, Sebastian |
 Norway | 20 | January | Bastian, Fabian, Sebastian |
 Poland | 20 | January | Dobiegniew, Fabian, Sebastian |
 Sweden | 20 | January | Fabian, Sebastian |
 USA | 20 | January | Fabia, Fabian, Fabiola, Sebastian, Sebastiana |
| Poland | 30 | January | Adelajda, Feliks, Gerard, Gerarda, Gerhard, Hiacynta, Maciej, Marcin, Martyna, Sebastian |
| Poland | 8 | February | Gniewomir, Gniewosz, Honorat, Jan, Ksenofont, Lucjusz, Paweł, Piotr, Salomon, Sebastian, Żaklina |
 Greece | 26 | February | Porfyros, Sebastian, Fotini, Anatoli, Fay |
 Ukraine | 26 | February | Sebastian |
| Greece | 7 | June | Sevastianis, Sevasti, Sebastian |
| Greece | 24 | October | Sevastianis, Sebastian |
| Greece | 18 | December | Floros, Sebastian |
| Poland | 31 | December | Korneliusz, Mariusz, Melania, Sebastian, Sylwester, Tworzysław |
Name Day List - similar names (Sebastian)
| Country | Day | Month | Names |
 Spain | 19 | January | Mario, Vicente, Sebastián |
 Slovakia | 20 | January | Dalibor, Sebastián |
 Italy | 21 | January | Sebastiano |
| Poland | 16 | September | Antym, Cyprian, Edda, Edyta, Eufemia, Eugenia, Franciszek, Jakobina, Kamila, Kornel, Lucja, Łucja, Sebastiana, Sędzisław, Wiktor, Wiktoriusz |