I found his obit. I'm afraid it doesn't give any clues about the name change.
San Diego Union, Thursday, February 11, 1982
MORGAN -- Clifford F. Father of Coleen Morgan and Shirley C. Shore. Brother of Florence Pulice and James Doonan. 3 grandchildren. Funeral Service Fri. 2 p.m. Goodbody Blvd. Chapel. Interment Riverside National Cemetery. Goodbody Blvd. Chapel directing.