Dion's name day is July 6 in Denmark and October 9 in the USA.
Dion is a name of Greek origin, believed to be a shortened form of Dionysius, meaning "from Mount Nysa," a mythical mountain associated with the god of wine, revelry, and fertility. This lineage imbues the name with a certain sophisticated and spirited aura, often evoking a sense of charm and artistic sensibility. The mood of Dion leans towards elegant and somewhat romantic, carrying a gentle strength. While primarily masculine, it can be perceived as unisex in modern usage, adding to its versatile and approachable character. The name's subtle resonance hints at a creative and engaging personality.
| 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 |
 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 |
| 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 |
| Poland | 15 | May | Afanazy, Atanazy, Berta, Cecyliusz, Czcibora, Dionizja, Izydor, Jan, Nadzieja, Ruprecht, Strzeżysław, Zofia |
| 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 |
 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 |
| 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