The provided information indicates that Teo’s name day is observed on November 9th in two specific countries: Estonia and Finland.
Teo is primarily a masculine name derived from classical Greek roots, meaning “gift of God,” connecting it historically to longer names like Theodore and Mateo. In the USA, it functions as a short, stylish option, gaining steady traction for its international appeal and simple structure. Historically, its modern appearance reflects European influence, appealing to contemporary parents favoring brevity and strength. The name projects an energetic and sophisticated mood, suggesting a charming yet confident personality. Globally recognized as distinctly male, Teo is a concise name with deep, classical origins that remains highly relevant in the 21st century.
| Country | Day | Month | Names |
 Ukraine | 5 | January | Apollinaria, Teon |
 Bulgaria | 6 | January | Bogomil, Bogdan, Bogdana, Bozhidar, Bozhidara, Borislav, Borislava, Jordan, Yordan, Yordanka, Nayden, Teodosii |
 Lithuania | 8 | January | Apolinaras, Ginte, Teofilis, Vilintas |
| Bulgaria | 11 | January | Bogdan, Bogdana, Bogomil, Bogomila, Teodosii |
 Spain | 25 | January | Elvira, Paula, Timoteo |
 Italy | 27 | January | Timoteo, Tito |
| Ukraine | 6 | February | Teofil, Teofila |
| Italy | 8 | February | Teodoro |
 Poland | 21 | February | Eleonora, Feliks, Fortunat, Kiejstut, Teodor, Wyszeniega |
 USA | 24 | February | Maddison, Madison, Madisyn, Madyson, Mateo, Mathew, Mathias, Matt, Mattea, Matthew, Matthias, Mattias, Mattie, Matty, Modesto |
 Croatia | 27 | February | Roman, Teofil, Bogoljub |
| Bulgaria | 7 | March | Bozhan, Bozhidar, Bozhidara, Bozhil, Bozhko, Emanuil, Manol, Mancho, Teodor, Teodora, Toto, Todor, Teodor, Todora, Dora, Bogdan, Bogdana |
| Lithuania | 13 | March | Kristina, Liutauras, Teodora, Vaidile |
| Italy | 26 | March | Emanuele, Teodoro |
| Poland | 26 | March | Emanuel, Feliks, Larysa, Manuela, Nikifor, Teodor, Tworzymir |
| Croatia | 1 | April | Hugo, Teodora |
 Latvia | 1 | April | Dagne, Dagnis, Tautmilis, Teodora, Teofils |
| Lithuania | 1 | April | Dainora, Rimgaudas, Teodora |
| Poland | 1 | April | Chryzant, Grażyna, Hugo, Hugon, Katarzyna, Teodora, Tolisław, Zbigniew, Zbyszko |
 Greece | 10 | April | Eteoklis, Hercules, Homer, Timothy, Dionisis, Pericles, Sofocles |
| Poland | 20 | April | Agnieszka, Amalia, Czech, Czechasz, Czechoń, Czesław, Florencjusz, Florenty, Nawoj, Sulpicjusz, Szymon, Teodor |
| Poland | 22 | April | Heliodor, Kajus, Leonia, Leonid, Łukasz, Soter, Strzeżymir, Teodor |
| Spain | 22 | April | Teodoro, Alexander, Apeles |
| Poland | 27 | April | Anastazy, Andrzej, Bożebor, Kanizjusz, Martyn, Piotr, Teofil, Zyta |
| Spain | 29 | April | Teodora, Karen, Katia, Wilfredo, Catalina |
| Spain | 1 | May | Berta, Tamar, Tamara, Oroncio, Andeoro, Teodardo, Paciencia |
| Spain | 3 | May | Juvenal, Violeta, Evencio, Teódulo, Alejandro, Estela, Felipe |
| Poland | 5 | May | Irena, Ita, Pius, Teodor, Waldemar, Zdzibor |
| Croatia | 19 | May | Celestin V. p., Rajko, Teofil, Inka |
| Poland | 20 | May | Anastazy, Asteriusz, Bazyli, Bazylid, Bazylis, Bernardyn, Bernardyna, Bronimir, Iwo, Sawa, Teodor, Wiktoria |
| Poland | 29 | May | Bogusława, Maksymilian, Maria Magdalena, Teodor, Teodozja |
| Spain | 29 | May | Alejandro, Justo, Teodosia |
| Poland | 31 | May | Aniela, Bożysława, Ernesta, Ernestyna, Feliks, Petronela, Petronia, Petroniusz, Teodor |
| Spain | 5 | June | Eloisa, Marcia, Igor, Valeria, Nicanor, Doroteo, Bonifacio |
| Poland | 11 | June | Anastazy, Barnaba, Feliks, Radomił, Teodozja |
| Poland | 21 | June | Albaniusz, Alicja, Alojza, Alojzy, Demetria, Domamir, Marta, Rudolf, Rudolfa, Rudolfina, Teodor |
| Latvia | 1 | July | Imants, Ingars, Intars, Teobalds |
| Poland | 1 | July | Aaron, Bogusław, Halina, Klarysa, Marian, Niegosława, Teobald |
| Spain | 2 | July | Visitación, Martiniano, Vidal, Teodorico, Teobaldo |
| Lithuania | 4 | July | Gedgaile, Malvina, Skalvis, Teodoras |
| Poland | 4 | July | Ageusz, Alfred, Aurelian, Elżbieta, Innocenta, Innocenty, Józef, Julian, Malwin, Malwina, Odo, Teodor, Wielisław |
| Spain | 22 | July | Teófila, Zoraida, Magdalena, Zaida, Primitiva |
| Poland | 27 | August | Angel, Angelus, Cezary, Gebhard, Józef, Kalasanty, Małgorzata, Przybymir, Rufus, Teodor |
 Hungary | 11 | September | Teodóra |
| Poland | 17 | September | Ariadna, Dezyderiusz, Drogosław, Franciszek, Hildegarda, Justyn, Justyna, Lambert, Lamberta, Narcyz, Teodora |
| Poland | 19 | September | Alfons, Alfonsyna, January, Konstancja, Sydonia, Teodor, Więcemir |
| Italy | 21 | September | Matteo |
| Spain | 21 | September | Mateo, Mauricio |
| Poland | 24 | September | Gerard, Gerarda, Gerhard, Maria, Teodor, Tomir, Uniegost |
| Ukraine | 29 | September | Teofan |
| Poland | 2 | October | Dionizy, Leodegar, Stanimir, Teofil, Trofim |
| Croatia | 13 | October | Edvard kr., Edo, Teofil |
| Poland | 13 | October | Daniel, Edward, Gerald, Geraldyna, Maurycy, Mikołaj, Siemisław, Teofil |
 Czechia | 23 | October | Teodor |
| Poland | 23 | October | Iga, Ignacja, Ignacy, Jan, Marlena, Odilla, Roman, Seweryn, Teodor, Włościsław, Żegota |
| Poland | 25 | October | Bończa, Bonifacy, Chryzant, Daria, Inga, Kryspin, Maur, Sambor, Taras, Teodozjusz, Wilhelmina |
| USA | 27 | October | Cale, Caleb, Feodor, Isaac, Isaak, Issac, Izaac, Kaleb, Ted, Teddy, Teodor, Theodora, Theodore |
| Poland | 29 | October | Euzebia, Franciszek, Longin, Longina, Lubogost, Narcyz, Teodor, Wioletta |
| Latvia | 9 | November | Teodors |
| Lithuania | 9 | November | Dargintas, Estela, Skirtaute, Teodoras |
 Norway | 9 | November | Teodor, Tordis |
| Poland | 9 | November | Bogudar, Genowefa, Nestor, Teodor, Ursyn |
 Slovakia | 9 | November | Teodor |
| Spain | 9 | November | Teodoro |
 Sweden | 9 | November | Teodor, Teodora |
| Poland | 11 | November | Anastazja, Bartłomiej, Maciej, Marcin, Prot, Spycisław, Teodor |
| Spain | 14 | November | Teodoto, Clemente |
| Hungary | 20 | December | Teofil |
| Lithuania | 20 | December | Daugardas, Grazvile, Teofilis |
| Poland | 20 | December | Amon, Bogumiła, Dominik, Liberat, Teofil |
| Spain | 27 | December | Teófanos |
| Poland | 28 | December | Antoni, Dobrowiest, Emma, Godzisław, Teofila |
| Lithuania | 29 | December | Gaja, Gentvainas, Teofile |
Estonia 
Finland