Quillian

Quillian is an anglicized form of the Irish surname Ó Coileáin, which means 'descendant of Coileán'. Coileán itself is a diminutive of 'coileach', meaning 'cock' or 'rooster', but it also historically meant 'whelp' or 'pup', and by extension, a young warrior. The name has ancient roots in Ireland, particularly associated with the O'Collins clan, who were prominent in County Limerick and County Cork.

While primarily a surname, Quillian has seen occasional use as a given name, particularly in regions with strong Irish heritage. Its use as a first name is relatively uncommon, maintaining its distinctive and historical feel. The transition from surname to given name is a common phenomenon in English-speaking cultures, often driven by a desire to honor family lineage or to choose a unique-sounding name.