The surname Dillon is of Irish origin, tracing its roots back to Northern Brittany. It is derived from a cadet branch of the Viscomte de Leon family. The name was introduced to Ireland by Sir Henry de Leon in 1185, who was in the service of Prince John. Upon marrying Maud de Courcy, Sir Henry was granted significant lands in the regions of Meath and Westmeath, marking the establishment of the Dillon family in Ireland.
Based on Census data, Dillon ranks #683 among U.S. last names, with an estimated 50465 individuals — approximately 17 per 100,000 people.
Our database contains over 19782 people with the last name Dillon. This surname is most commonly found in Florida, Ohio, California. We have over 19 unique first names combined with the last name Dillon in our records. The most frequent first names associated with this surname are James, Michael, Robert.
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