Stian's name day is September 13 in Norway.
Stian is a historically significant Norwegian masculine name, tracing its origin back to Old Norse elements related to pathways and travel. Its usage in the USA is sparse, often signaling direct Scandinavian heritage among those carrying the name. The name experienced a notable rise in prominence in Norway during the 20th century, becoming a modern classic there. Stian conveys a strong, grounded, and straightforward mood, possessing a rugged, nature-like tone. It is globally recognized exclusively as a male identifier, firmly establishing its traditional gender identity. This concise name choice bridges ancient linguistic roots with modern practicality.
| Country | Day | Month | Names |
 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 |
| 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 |
| Spain | 13 | February | Cristian, Benigno |
| Poland | 18 | February | Albert, Alberta, Albertyna, Fryda, Konstancja, Krystiana, Maksym, Sawa, Sylwan, Sylwana, Symeon, Więcesława, Zula, Zuzanna |
 Greece | 26 | February | Porfyros, Sebastian, Fotini, Anatoli, Fay |
 Ukraine | 26 | February | Sebastian |
| Austria | 21 | March | Axel, Christian, Emilia |
| Austria | 14 | May | Bonifatius, Christian |
| Denmark | 14 | May | Kristian |
| Norway | 14 | May | Karsten, Kristen, Kristian |
| Ukraine | 24 | May | Christian |
| Greece | 7 | June | Sevastianis, Sevasti, Sebastian |
 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 |
| Greece | 2 | August | Justianos |
 Czechia | 5 | August | Kristian |
| Poland | 16 | September | Antym, Cyprian, Edda, Edyta, Eufemia, Eugenia, Franciszek, Jakobina, Kamila, Kornel, Lucja, Łucja, Sebastiana, Sędzisław, Wiktor, Wiktoriusz |
| Slovakia | 19 | October | Kristián |
| Greece | 24 | October | Sevastianis, Sebastian |
 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 |
| 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 |