From Irish Gaelic 'Ríogán' meaning 'little king,' also a literary name from King Lear.
Regan is a name with deep Gaelic roots, generally traced to the Irish surname Ó Riagáin, meaning “descendant of Riagán.” The personal name Riagán is often linked to a diminutive of rí, “king,” though scholars also connect it to ideas of authority or impulsive vigor. Like many Irish names, Regan traveled from clan name to surname and then into use as a given name, especially in the modern era when surname-style first names became fashionable.
Its compact sound gives it both Celtic ancestry and contemporary polish. The name’s literary shadow is impossible to ignore: Regan is one of King Lear’s daughters in Shakespeare’s tragedy. That association gave the name a long afterlife in English literature, though not always a gentle one, since Shakespeare’s Regan is formidable and cruel.
Yet names often outgrow even strong fictional reputations, and Regan eventually did. In the twentieth century it re-entered public naming culture with a fresh, tailored feel, helped by broader interest in Irish-derived names and crisp, gender-flexible surnames as first names. In modern usage, Regan has moved between masculine and feminine contexts, though in the United States it has often leaned feminine.
Spelling and sound link it to names like Reagan and Raegan, which also rose in visibility through politics and pop culture, especially after the surname of President Ronald Reagan became familiar worldwide. That overlap softened the Shakespearean edge and recast the name as brisk, smart, and contemporary. Regan today carries several histories at once: Gaelic lineage, Shakespearean drama, and the modern preference for names that sound grounded but distinctive.