Etymology

Reagan

Rea·gan
R1E1A1G2A1N1

Today it means: A surname from Irish; variant forms Regan, Riggen. Full definition →

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The story

Anglicized from Irish Gaelic Ó Riagáin (“descendant of Riagán”), a personal name possibly derived from ríodhgach (“impulsive, furious”), an alternative form of ríogach.

Etymology from Wiktionary, CC BY-SA 4.0.