The provided text confirms that the name day for Tia is observed in the United States on January 5.
Tia maintains solid global popularity, often recognized in both European and Latin American contexts for its simplicity and clear sound. Historically, the name often functioned as a diminutive of longer feminine names like Patricia or Letitia, giving it diverse linguistic roots. The name is overwhelmingly female, offering a clear gender classification across all major naming regions. Its meaning is often associated with the Spanish word for "aunt" or occasionally linked to concepts of divinity. The overall vibe of Tia is light, playful, and elegant, conveying approachability and modern charm.
| Country | Day | Month | Names |
 Bulgaria | 12 | January | Tanya, Tatyana, Tatiana |
 France | 12 | January | Tatiana |
 Greece | 12 | January | Mertios, Tatiana |
 Romania | 12 | January | Tatiana |
 Spain | 12 | January | Alfredo, Tatiana, Tania, Hilario |
 Ukraine | 12 | January | Tetiana, Tania |
 Denmark | 19 | January | Pontianus |
| Spain | 19 | January | Mario, Vicente, Sebastián |
 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 |
 Slovakia | 20 | January | Dalibor, Sebastián |
 Sweden | 20 | January | Fabian, Sebastian |
 USA | 20 | January | Fabia, Fabian, Fabiola, Sebastian, Sebastiana |
 Italy | 21 | January | Sebastiano |
| USA | 22 | January | Enoch, Piper, Vicenta, Vicente, Vince, Vincent, Vincentia, Vincenzo, Vinnie |
| Poland | 25 | January | Miłosz, Miłowan, Miłowit, Paweł, Tacjanna, Tatiana |
| Poland | 30 | January | Adelajda, Feliks, Gerard, Gerarda, Gerhard, Hiacynta, Maciej, Marcin, Martyna, Sebastian |
| Slovakia | 1 | February | Tatiana |
| Greece | 3 | February | Asimina, Malamati, Stamatis, Stamatia |
| Poland | 8 | February | Gniewomir, Gniewosz, Honorat, Jan, Ksenofont, Lucjusz, Paweł, Piotr, Salomon, Sebastian, Żaklina |
| Spain | 13 | February | Cristian, Benigno |
| Poland | 18 | February | Albert, Alberta, Albertyna, Fryda, Konstancja, Krystiana, Maksym, Sawa, Sylwan, Sylwana, Symeon, Więcesława, Zula, Zuzanna |
| Denmark | 24 | February | Mattias |
 Estonia | 24 | February | Mattias, Madis, Madi, Matis, Mati, Matti, Mats, Mait, Maido, Maidu, Mäido |
| Finland | 24 | February | Matias, Matti |
| Norway | 24 | February | Mathias, Mats, Mattias, Mattis |
| Sweden | 24 | February | Mats, Mattias |
| USA | 24 | February | Maddison, Madison, Madisyn, Madyson, Mateo, Mathew, Mathias, Matt, Mattea, Matthew, Matthias, Mattias, Mattie, Matty, Modesto |
| Greece | 26 | February | Porfyros, Sebastian, Fotini, Anatoli, Fay |
| Ukraine | 26 | February | Sebastian |
 Hungary | 13 | March | Krisztián, Ajtony |
| Austria | 21 | March | Axel, Christian, Emilia |
| Austria | 5 | April | Crescentia, Vinzenz |
| Spain | 29 | April | Teodora, Karen, Katia, Wilfredo, Catalina |
| Austria | 14 | May | Bonifatius, Christian |
| Denmark | 14 | May | Kristian |
| Italy | 14 | May | Mattia |
| Norway | 14 | May | Karsten, Kristen, Kristian |
| Spain | 14 | May | Matías, Corona, Cora, Henedina, Alba, Gemma |
| Denmark | 19 | May | Potentiana |
| Ukraine | 24 | May | Christian |
| Hungary | 6 | June | Norbert, Cintia |
| Greece | 7 | June | Sevastianis, Sevasti, Sebastian |
| Ukraine | 15 | June | Krystsentia |
| France | 30 | June | Adolphe, Martial |
 Latvia | 24 | July | Krista, Kristiana, Kristine, Krists |
| USA | 24 | July | Amalia, Amelia, Boris, Chris, Christa, Christen, Christian, Christiana, Christie, Christin, Christina, Christine, Christy, Chrysta, Cristina, Cristian, Declan, Kiersten, Kirsten, Kirstie, Kirstin, Krista, Kristen, Kristian, Kristi, Kristin, Kristina, Kristine, Kristy, Kristyn, Maya |
| Spain | 25 | July | Jaime, Santiago |
| USA | 25 | July | Coby, Colby, Diego, Israel, Jack, Jackie, Jackson, Jaclyn, Jacob, Jacoby, Jacqueline, Jacquelyn, Jacques, Jaime, Jake, Jakob, James, Jameson, Jamie, Jaquan, Jaqueline, Jaxon, Jaxson, Jim, Jimena, Jimmie, Jimmy, Kobe, Koby, Kolby, Santiago |
| Greece | 2 | August | Justianos |
 Czechia | 5 | August | Kristian |
| Romania | 9 | August | Matia |
| Austria | 13 | August | Cassian, Hippolyt, Marko, Pontianus |
| France | 18 | August | Hélène, Laétitia |
| Norway | 13 | September | Stian, Stig |
| USA | 14 | September | Keisha, Lakeisha, Latasha, LaTease, Latisha, Leticia, Letitia, Letty, Tish, Tisha |
| Poland | 16 | September | Antym, Cyprian, Edda, Edyta, Eufemia, Eugenia, Franciszek, Jakobina, Kamila, Kornel, Lucja, Łucja, Sebastiana, Sędzisław, Wiktor, Wiktoriusz |
| Denmark | 19 | September | Constantia |
| Slovakia | 19 | October | Kristián |
| Greece | 24 | October | Sevastianis, Sebastian |
| USA | 5 | November | Perdita, Tiara, Tiera, Tierra, Swain, Swana |
| France | 12 | November | Christian |
| Finland | 13 | November | Ano, Kristian |
| Sweden | 13 | November | Krister, Kristian |
| Poland | 4 | December | Barbara, Berno, Biernat, Chrystian, Hieronim, Krystian, Piotr |
| Austria | 15 | December | Carlo, Christiane, Nina |
| Poland | 15 | December | Celina, Fortunata, Iga, Ignacja, Ignacy, Krystiana, Nina, Walerian, Waleriana, Wolimir, Żegota |
| Romania | 15 | December | Antia, Elefterie, Suzana |
| Greece | 18 | December | Floros, Sebastian |
| Bulgaria | 25 | December | Hristina, Hristo, Kristina, Kristian, Kristiana, Emil, Itso, Icho, Mladen, Radoslav, Radoslava, Radomir, Radostin, Radostina, Hristofor |
| Poland | 31 | December | Korneliusz, Mariusz, Melania, Sebastian, Sylwester, Tworzysław |