Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
KEELTY
As described in historical dictionaries
Patronymica Britannica (1860)
KEELTY. KIELTY. From the ancient personal name Caoilte, borne by one of the heroes of Ossiau. Ulster. Journ. of Archajol. No. 2.