Diane Keaton

She is not related to Michael Keaton, as her birth name is Diane Hall. She changed her last name to her mother's maiden name as a result of a Diane Hall already being in the Actors Guild. According to her, Michael Keaton had a similar problem with his natural name when entering the Guild after his birth name is Michael Douglas (not related to Kirk Douglas's son, Michael Douglas), though he picked "Keaton" because he liked Diane's name.

I think that people who are famous tend to be underdeveloped in their humanity skills.