Tom's name day is observed on April 13 in the USA. Additionally, the name day is celebrated on December 21 in both Estonia and Norway.
Tom is a decidedly masculine name, highly regarded in the USA as a concise and enduring classic. Historically, it is derived from an Aramaic term meaning "twin," giving it a clear and ancient origin. The name saw extensive popularity throughout the mid-20th century in America, becoming a standard, recognizable choice. Its inherent mood is characterized as strong, reliable, and fundamentally trustworthy, projecting an approachable personality. This designation remains popular due to its simplicity and powerful traditional background. It evokes a grounded, straightforward vibe, often associated with dependability.
| 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 |
 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