As described in historical dictionaries

Patronymica Britannica (1860)

QUILLAN. "The Mae Quillans were lords of the territory of the Routes, in co. Antrim, holding their chief residence in the fine old sea-girt castle of Dunluce. They are considered to have been invaders, from Wales, on earlier inhabitants of the North." D'Altou.

Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.


BritishSurnames.uk is a Good Stuff website.