of the name CULPIN or CULPAN
Phillipe Catelin, a french genealogist places the origins in a diminutive of the christian name Nicholas (often termed COL)
Nom assez fréquent dans le Nord-Pas-de-Calais et en Belgique. C'est un diminutif du nom de baptême Nicolas, formé à la fois par aphérèse (Nicolas, Nicol > Col) et par suffixation (suffixe diminutif -epin).
Jan George's book on Culpans also traces back the origins of the Culpan form of the surname to France but with a different origin.
The name Culpan is not a common one and is known only in the Halifax area of West Yorkshire from earliest times. It is peculiar to that part of the ancient parish of Halifax allotted to William of Warren, by the King, and comes from the Old French word "culpan" or "colpan" meaning "a detached part".