Gallen

The name Gallen is primarily of Irish origin, derived from the Gaelic surname Ó Gaillín, which means 'descendant of Gaillín'. The personal name Gaillín itself is a diminutive of 'gall', meaning 'stranger' or 'foreigner'. It was often used to refer to Norsemen or other non-Irish invaders during early Irish history. Over time, the surname evolved and was sometimes adopted as a given name.

While less common as a first name than as a surname, Gallen has seen occasional use, particularly in areas with strong Irish heritage. Its meaning of 'calm' or 'tranquil' is often associated with the sound of the name rather than its direct etymological root, which refers to a 'stranger'. This interpretation likely developed through folk etymology or a desire to assign a more positive meaning to the name.