The provided information indicates that the name day for Dion is recognized on two different dates depending on the country. In Denmark, Dion’s name day is observed on July 6th. Conversely, the recognition date for Dion in the United States is marked on October 9th.
The name Dion originates from ancient Greek, typically meaning "of Zeus" or divine, reflecting a deep classical heritage. Historically, its usage in the USA has been consistent since the mid-20th century, establishing it as a recognized but uncommon choice. Predominantly classified as a masculine name globally, Dion projects an elegantly strong and dynamic mood. This concise four-letter name avoids being overly formal while maintaining a sophisticated tone. Its ancient root provides historical gravity, while its modern sound ensures contemporary relevance and appeal.
| 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