Riley peaked in 2006 at rank 229 for boys, where it currently sits. The total American count of 103,344 (boys only) reflects a name whose chart line has been complicated by parallel girl-name use that grew during the same window. Riley is one of the most studied unisex transitions in modern American naming, and the boy-name story is shaped largely by what happened on the girl-name side simultaneously.
The Irish valor
Riley comes from Irish Raghaillaigh, the name of a medieval clan in County Cavan, often glossed as meaning "valiant" or "courageous" though the etymology is genuinely contested. The Anglicized surname O'Reilly (or Reilly) and the simplified first-name form Riley descended from the same Gaelic root. For most of American history Riley was an Irish-American surname rather than a first name.
The first-name turn began in the late 20th century, with Riley appearing as a boy name in the 1980s and gaining serious traction in the 1990s. The boy-name use peaked in 2006, but the girl-name use was simultaneously climbing and eventually overtook it in raw numbers, fundamentally reshaping how parents of either gender perceive the name.
The unisex split
Riley is now used more often for girls than for boys in American records, which has affected boy-name parents' willingness to pick it. The 2015 Pixar film Inside Out featured a girl protagonist named Riley, which reinforced the girl-name association for a generation of children currently in elementary and middle school. Earlier media bearers like Boy Meets World's Cory's son Riley (a girl) had similar effects on younger audiences.
For boys, Riley sits inside an Irish-revival cluster with Finn and Rory. The cluster prizes warmth, soft consonants, and Celtic anchoring without traditional Patrick-Sean weight.
The counter-reading
The honest concern with Riley as a boy name in 2025 is the gender-association drift. The name will read as ambiguous on rosters and in correspondence, and the assumption from strangers will increasingly be female. Some families embrace this ambiguity; others find it a continuous low-grade friction. Parents who want clearly Irish-male can consider Reilly (the more masculine-coded spelling) or Rory as alternatives. The unisex direction looks unlikely to reverse.