A spelling variant of Reagan or Regan, from an Irish surname meaning little king.
Reaghan is a variant spelling of Reagan, an Irish name with roots in the Gaelic *Ó Riagáin*, meaning "descendant of Riagán." The personal name Riagán is thought to derive from *rí* ("king") combined with a diminutive suffix, yielding something like "little king" or "kingly one" — a name with quiet aristocratic ambition built into its etymology. The Ó Riagáin clan was historically based in Leinster and Meath, and the name traveled to the United States with the great waves of Irish emigration in the nineteenth century, eventually shedding its Ó prefix and settling into the surname Reagan.
As a given name, Reagan gained enormous visibility through Ronald Reagan, the fortieth President of the United States, who served from 1981 to 1989. In an American naming tradition where presidential surnames frequently become first names — Lincoln, Monroe, Madison — Reagan made a particularly successful crossover, appealing to parents across the political spectrum who simply liked its strong, brisk sound. By the 2000s it was charting consistently as a girl's name, its single-surname-style syllable sitting alongside similar choices like Quinn, Sloane, and Logan.
The Reaghan spelling softens the name slightly, replacing the stern presidential association with a more lyrical quality — the *-han* ending reads as more Celtic and less political, evoking the green hills of Connacht rather than a California ranch. It also provides distinctiveness in a crowded field, ensuring that a girl named Reaghan is unlikely to be confused with the several Reagans in any given classroom. The name has proven durable across generations, carrying confidence without severity and heritage without heaviness.