Dillon seems like a variant spelling of Dylan at first glance, an Irish name meaning “great tide” or “great flow” and the name of a sea god in Welsh mythology, but Dillon has its own roots. There seems to be a lot of contradictory information on it:

  • it’s an anglicized form of Gaelic surname Ó Duilleáin meaning “descendant of Duilleán”, the latter meaning “blind” or “blind one”;
  • it’s also possible that it may be derived from Irish dealan meaning “a flash of lightning” or an Irish word meaning “faithful, loyal”;
  • Dillon could also either derive from Dilwyn (or Dilun), a locational name referring to someone who lived near the town, which comes from Old English diglum meaning “recess” or”retreat”- referring to someone who lives at the shady or secret places;
  • it may also be derived from a Germanic personal name, Dillo, a name of uncertain origin meaning “destroyer”;
  • it could also be a transposition of de Leon, a place name referring to someone who came from a town in Lyon, France, or a nickname referring to a fierce/brave warrior, from the animal lion, introduced during the Anglo-Norman invasion of 1169.

Origin: Gaelic, Old English, Germanic



  • Dylan (English, Welsh)
  • Dillan (English)


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