By Carol Baxter, Copyright 2012. The origins of the surname Quelch are inadequately explained by the entries found in various surname dictionaries. Original research by the author has determined that the surname is mainly found in south-east England with its focal point in the county of Berkshire.et this is not reflected in the surname dictionaries which attempt to record the origin and derivation of the surname. All of the surname dictionaries agree that Quelch is locational in origin, that the progenitor of the surname was a Welsh(man).