The Irish surname O'Fallon is an anglicized form of the Gaelic name Ó Fallamhain meaning “descendant of Fallamhan,” a name meaning “leader”(from follamhnas meaning “supremacy.”) The name is mainly found in Counties Galway and Roscommon in the western province of Connaught. The first written reference to the name is in 1585 in Dysart, Athlone, County Roscommon. The name is first recorded in the New World in the 17th Century where immigration records chart the arrival in Virginia of one Teague Fallon. Today there are approximately 500 bearers of the nameO'Fallon in the United States.
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