Dion's name day is observed on July 6th in Denmark and October 9th in the USA.
Dion is a name with ancient Greek origins, linked to the god Dionysus, and carries a sense of artistic and celebratory energy. It has experienced moderate popularity in the United States, peaking in the mid-20th century, and is more common in French-speaking countries and Australia. Generally considered a masculine name, it evokes a mood of quiet confidence and understated elegance. Its historical roots lend it a gravitas, while its simplicity contributes to its enduring appeal. The name suggests a personality that is both creative and grounded, with a natural charisma.
| Country | Day | Month | Names |
 Greece | 23 | January | Agathagellos, Dionisis |
 Spain | 14 | February | Dionisio, Valentín, Valentina, Odile |
 Poland | 26 | February | Aleksander, Bogumił, Cezariusz, Dionizy, Mirosław, Nestor |
 Romania | 10 | March | Anecton, Ciprian, Codrat, Crescent, Dionisie, Pavel |
 Croatia | 20 | March | Klaudija, Dionizije, Vladislav |
| Croatia | 8 | April | Dionizije, Alemka |
 Lithuania | 8 | April | Dionyzas, Girtautas, Julija, Skirgaile |
| Poland | 8 | April | Apolinary, Cezary, Cezaryna, Dionizy, Gawryła, January, Radosław, Sieciesława |
| Romania | 8 | April | Agav, Irodion, Lazar, Ruf |
| Spain | 8 | April | Dionisio, Amancio |
| Greece | 10 | April | Eteoklis, Hercules, Homer, Timothy, Dionisis, Pericles, Sofocles |
| Poland | 21 | April | Addar, Anzelm, Bartosz, Drogomił, Feliks, Irydion, Konrad, Konrada, Selma |
| Romania | 3 | May | Irodion, Mavra, Timotei |
| Poland | 15 | May | Afanazy, Atanazy, Berta, Cecyliusz, Czcibora, Dionizja, Izydor, Jan, Nadzieja, Ruprecht, Strzeżysław, Zofia |
| Romania | 3 | June | Claudie, Dionisie, Ipatie, Luchilian, Paul |
| Romania | 1 | September | Dionisie |
| Poland | 2 | September | Absalon, Bohdan, Czech, Czechasz, Czechoń, Czesław, Dersław, Dionizy, Eliza, Henryk, Julian, Stefan, Tobiasz, Wilhelm, Witomysł |
| Poland | 9 | September | Augustyna, Aureliusz, Dionizy, Gorgoncjusz, Pimen, Piotr, Ścibor, Ścibora, Sergiusz, Sobiesąd |
| Poland | 20 | September | Dionizy, Eustachiusz, Eustachy, Fausta, Faustyna, Filipina, Irena, Oleg, Ostap, Sozant |
| Poland | 2 | October | Dionizy, Leodegar, Stanimir, Teofil, Trofim |
 Bulgaria | 3 | October | Ruska, Dionisii |
| Greece | 3 | October | Dionisios, Dennis |
| Romania | 3 | October | Dionisie |
 Austria | 9 | October | Dionys, Günter, Sara, Johannes |
| Croatia | 9 | October | Ljudevit Bertran, Dionizije, Ivan Leon |
 Denmark | 9 | October | Dionysius |
 Italy | 9 | October | Dionigi e compagni |
| Lithuania | 9 | October | Dionyzas, Geditas, Virgaile |
| Poland | 9 | October | Arnold, Arnolf, Atanazja, Bogdan, Dionizjusz, Dionizy, Jan, Ludwik, Przedpełk |
 Slovakia | 9 | October | Dionýz |
| Spain | 9 | October | Abrahan, Dionisio |
| Poland | 16 | October | Ambroży, Aurelia, Dionizy, Florentyna, Galla, Gallina, Gaweł, Gerard, Gerarda, Gerhard, Grzegorz, Radzisław |
| Romania | 10 | November | Cuart, Erast, Olimp, Rodion, Sosipatru |
| Poland | 16 | November | Aureliusz, Dionizy, Edmund, Gertruda, Leon, Marek, Maria, Niedamir, Otomar, Paweł, Piotr |
| Poland | 17 | November | Dionizy, Floryn, Grzegorz, Hugo, Hugon, Salome, Salomea, Sulibor, Zbysław |
| Poland | 6 | December | Dionizja, Emilian, Jarema, Jarogniew, Mikołaj |
| Poland | 14 | December | Alfred, Arseniusz, Izydor, Naum, Pompejusz, Sławobor, Spirydion |
| Greece | 17 | December | Daniel, Dionisios |
| Poland | 25 | December | Anastazja, Eugenia, Piotr, Spirydion |
| Poland | 26 | December | Dionizy, Szczepan, Wróciwoj |
| Poland | 30 | December | Dawid, Dawida, Dionizy, Eugeniusz, Irmina, Katarzyna, Łazarz, Rainer, Sabin, Sewer, Uniedrog |
USA