While the previous answers may help some of the time, one should seek the origin of the name. I Googled the surname Klepfish and learned:
Klepfish Surname Definition: (from an ancestor's occupation) A Yiddish version of Klippfisch (“stockfish”), cod or haddock, salted or dried. The bearer of this name was a merchant of this commodity. So there's no reason for all Klepfish families to be related. Baker and Cooper families often aren't related. My surname is based on a town name (Noerdlingen in Bavaria), so Nordlingers are people whose ancestors left that town over centuries. They are Jewish, Catholic and Protestant. Some of them are related to each other, but many are not.
Los Angeles California