Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
HASLER
As described in historical dictionaries
Patronymica Britannica (1860)
HASLER. The Dutch hasselaer, a hazel tree, has been suggested ; but there are places in cos. Dorset, Warwick, and Stafford called Haselor.
Surname type: Occupational name
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English