From Irish 'cuileann' meaning holly tree, or a Scottish place name from Cologne.
Cullen is an Irish and Gaelic surname-name with roots usually connected to Ó Cuilinn, meaning "descendant of Cuilinn." The personal name Cuilinn is often linked to the word cuileann, "holly," a tree that carried protective and symbolic value in Celtic tradition. Like many surnames from Ireland and Scotland, Cullen later crossed into use as a first name, especially in places where ancestral surnames became markers of heritage and distinction.
It also appears as a Scottish place name, which adds another layer of geographic resonance. For much of its history, Cullen felt patrician, spare, and quietly masculine, never as common as more familiar Irish-derived names. In recent decades, however, it received a major boost in visibility from literature and popular culture, especially the Twilight series, in which the Cullen family became central figures.
That association gave the name a gothic-romantic sheen and introduced it to audiences who might never have encountered it as a surname or Celtic relic. Despite that modern pop-cultural wave, Cullen still retains an older texture. The holly connection gives it a subtle natural symbolism, suggesting endurance, winter greenery, and protection.
Its sound is compact and reserved, which may be part of its appeal: it feels historical without being ornate. Cullen is a good example of how a surname can carry centuries of linguistic history and then suddenly be recast by fiction, gaining new emotional color while still preserving the bones of its Gaelic past.