Leader's descendant or of the family of Fallamhan
Fallyn is a modern American spelling variant of the Irish surname Fallon. It is derived from the Gaelic name Ó Fallamhain, which means descendant of Fallamhan, a name rooted in the word for leader or ruler.
About 33 girls were named Fallyn in 2025.
US births per 5-year period, 1990–present (SSA data).
