Tom's name day is April 13 in USA, December 21 in Estonia, December 21 in Norway.
Tom is a highly popular name in the United States and across English-speaking nations, known for its enduring historical presence. Originating from an Aramaic word meaning twin, the name has deep linguistic roots that have sustained its use for centuries. It is characterized by a strong, friendly, and approachable mood that feels both classic and energetic. As a primarily male name, it is recognized globally for its simplicity and straightforward nature. Its historical transition from a nickname to a formal name has solidified its status in various cultures. This name continues to be a top choice for its reliability and timeless appeal.
| Country | Day | Month | Names |
 Denmark | 27 | January | Chrysostomus |
 Poland | 27 | January | Angelika, Ilona, Jan Chryzostom, Julian, Przybysław |
 Spain | 27 | January | Ángela, Tomás de Aquino, Valerio |
 Croatia | 28 | January | Toma, Tomislav |
| Spain | 28 | January | Tomas, Pedro Nolasco |
| Poland | 10 | February | Elwira, Gabriel, Jacek, Jacenty, Scholastyka, Tomisława |
| Poland | 11 | February | Adolf, Adolfa, Adolfina, Alf, Bernadetta, Dezydery, Eufrozyna, Łazarz, Lucjan, Maria, Olgierd, Świętomira |
 Latvia | 20 | February | Otokars, Otomars, Smuidra, Vitauts |
 Czechia | 7 | March | Tomáš |
 Lithuania | 7 | March | Felicita, Galminte, Rimtautas, Tomas |
| Poland | 7 | March | Felicja, Nadmir, Paweł, Polikarp, Tomasz |
 Slovakia | 7 | March | Tomáš |
| Poland | 25 | March | Dyzma, Ireneusz, Lucja, Łucja, Lutomysł, Maria, Mariola, Wieńczysław |
 Bulgaria | 26 | April | Toma, Tomislav, Tomislava |
| Poland | 2 | May | Afanazy, Anatol, Atanazy, Longin, Longina, Walenty, Walter, Witomir, Zygmunt |
| Poland | 10 | May | Antonin, Częstomir, Izydor, Jan, Symeon, Wiktoryna |
| Bulgaria | 15 | June | Avgustin, Avgustina, Vitan, Vitomir |
| Croatia | 22 | June | Ivan Fisher, Toma More |
| Croatia | 3 | July | Toma apostol, Tomislav, Tomo, Miki |
 Italy | 3 | July | Tommaso |
| Spain | 3 | July | Tomás, Heliodoro, Jacinto, Amable, Enrique |
| Poland | 28 | July | Innocenta, Innocenty, Marcela, Pantaleon, Samson, Świętomir, Wiktor, Wiktoriusz |
| Poland | 2 | September | Absalon, Bohdan, Czech, Czechasz, Czechoń, Czesław, Dersław, Dionizy, Eliza, Henryk, Julian, Stefan, Tobiasz, Wilhelm, Witomysł |
| Italy | 13 | September | Giovanni Crisostomo |
| Spain | 13 | September | Juan Crisóstomo |
| Croatia | 22 | September | Toma Vil., Mauricije |
| Lithuania | 22 | September | Tarvinas, Tomas, Virmante |
| Poland | 22 | September | Joachim, Joachima, Maurycy, Prosimir, Tomasz |
| Poland | 24 | September | Gerard, Gerarda, Gerhard, Maria, Teodor, Tomir, Uniegost |
| Bulgaria | 6 | October | Toma, Tomislav, Tomislava |
 Romania | 6 | October | Toma |
 Ukraine | 6 | October | Thomas, Toma |
| Poland | 10 | October | Franciszek, German, Kalistrat, Lutomir, Paulin, Tomił |
| Spain | 10 | October | Tomás de Villanueva |
| Bulgaria | 18 | October | Zlatan, Zlatka, Zlatko, Zlatomir, Luka, Lukan, Zlata, Zlatina |
| Poland | 19 | October | Ferdynand, Fryda, Pelagia, Pelagiusz, Piotr, Siemowit, Skarbimir, Toma, Ziemowit |
| Latvia | 4 | November | Atis, Oto, Otomars |
 Greece | 13 | November | Xrysostomos |
| Poland | 16 | November | Aureliusz, Dionizy, Edmund, Gertruda, Leon, Marek, Maria, Niedamir, Otomar, Paweł, Piotr |
| Poland | 18 | November | Aniela, Cieszymysł, Filipina, Galezy, Klaudyna, Odo, Otto, Roman, Tomasz |
 Finland | 21 | December | Tuomas, Tomi, Tommi, Tuomo |
| Latvia | 21 | December | Saulcerite, Toms, Tomass |
| Lithuania | 21 | December | Girene, Honoratas, Norgaudas, Tomas |
| Poland | 21 | December | Balbin, Festus, Honorat, Tomasz, Tomisław |
 Sweden | 21 | December | Tomas |
| Croatia | 28 | December | Toma Becket, David, Davor |
| Italy | 29 | December | Tommaso Becket |
| Poland | 29 | December | Domawit, Dominik, Gosław, Jonatan, Marcin, Tomasz, Trofim |
USA 
Estonia 
Norway