[1] The original Gaelic form of the name Fallon is O Fallamhain.
Early Origins of the Fallon family The surname Fallon was first found in Galway (Irish: Gaillimh) part of the province of Connacht, located on the west coast of the Island, where they held a family seat from very ancient times.
The origin of the surname in Irish is "Leader" or "granddaughter/grandson of a rich king."
The Irish surname meaning “governor” or “supremacy.” Some have maintained that Fallon was originally pronounced with a long “a” as in “fall.” In Ireland, Fallon is exclusively a surname rather than a given name.
However outside of Ireland, particularly in the United States, it is occasionally used as a gender-neutral given name.