Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
CURLL
As described in historical dictionaries
Patronymica Britannica (1860)
CURLL. CURL. Probably the same as the Scottish carl, which is connected â– with the Germ, hed, fortis, corjiore robusto praeditus. See Jamieson.