User: Why did Ken Shamrock change his last name?
Assistant: Ken Shamrock changed his last name from Kilpatrick to Shamrock in honor of his adoptive father, Bob Shamrock.  Bob Shamrock legally adopted Ken after Ken was placed in Bob Shamrock's Boys' Home, following a period of homelessness after being kicked out of his stepfather's home, several foster homes, group homes, and a stint in juvenile home.