Dillon peaked in 1992 and carries 64,964 SSA records. At rank #868, it's the quieter cousin in the Dylan/Dillon family, same sound, different letter, different implied reference point. The distinction matters to the parents who choose it: Dillon leans Irish where Dylan leans Welsh and Dylanesque.
Irish Origins and the Patronymic Path
Dillon as a surname traces to the Irish Diolún, an anglicization of the Norman French surname de Leon — brought to Ireland by the Anglo-Norman settlement in the 12th century. The Dillon family became prominent in Irish nobility, and the name spread through Connacht and Meath. As a first name, it arrived in America through Irish immigration, where surname-to-first-name conversion was common across generations. The Irish naming tradition provides extensive context for how these surnames-turned-given-names have moved through American birth records.
Dylan vs. Dillon
Dylan — the dominant spelling — peaked around the same era and currently sits much higher in the rankings, buoyed by Dylan Thomas, Bob Dylan, and a generation of parents who grew up with those associations. Dillon is the variant that says: we like the sound but we're not leaning on the music reference. It's more surname-y, more distinctly Irish, slightly more unexpected on a 2025 birth certificate. Parents who want the sound without the rock-poet overlay often land here. Compare them directly at /compare to see the ranking divergence.
Counter-Reading
Dillon will spend its life being spelled Dylan by most people who hear it — that's probably the most consistent friction point. The spelling difference is one letter and one transposition, which sounds minor until you've corrected it a thousand times. It also peaked in 1992, which means it carries mild '90s suburban associations that haven't yet fully crossed into vintage territory. Sibling names like Brennan or Finn reinforce the Irish thread. Check the falling names trend to see where it sits now.