Teagan is an Irish name derived from the Old Irish taodhgán, a diminutive connected to a root meaning "poet" or "philosopher." With 5,491 SSA records for boys and a 2009 peak, it's a name that has largely migrated to the girls' side of the American naming ledger — but that migration is recent, and plenty of families still use it for boys with full confidence.
The Irish Roots
Teagan's etymology links it to the poetic tradition of early Irish culture, where the taodh root appears in names associated with wit and learning. It's a genuinely old Irish name, not a modern invention — which gives it a different cultural weight than many names that simply sound Celtic. In Ireland, it functions as a legitimate masculine name without ambiguity. Irish-origin names like Teagan, Declan, and Cormac have been finding American audiences for decades, carried by the Irish diaspora and admired by families with no Irish connection at all.
The Gender Shift Question
Teagan's American story is primarily a girls' name story now: the name has become substantially more common for girls over the past fifteen years, which means a boy named Teagan will encounter more confusion than he might have in 2009. This is the same trajectory traveled by names like Riley, Morgan, and Avery — names that were once firmly or ambiguously masculine and are now read as predominantly feminine in the United States. For parents who embrace gender-fluid naming or want a name with Celtic heritage regardless of convention, Teagan for a boy remains a valid choice. See how it compares at Teagan vs. Keagan.
The Counter-Reading: Gender Perception Is Real
A boy named Teagan in the 2020s will regularly be assumed to be a girl — not a catastrophic outcome, but one worth preparing for. The 2009 peak for male Teagans suggests the window of easy masculine usage is narrowing. Six-letter Irish boys' names with clearer masculine signals , Declan, Ciaran, Ronan , might serve a family wanting Celtic heritage without the ambiguity. The name's poetry-and-philosophy meaning is genuinely lovely; the question is whether that meaning is accessible enough to justify the everyday confusion.