Helen Hayes was born Helen Hayes Brown.
Meryl Streep was born Mary Louise Streep.
EDIT: Usually it's one of three reasons why an actor changes his/her name:
1) It sounds "ordinary."
2) It sounds "funny" or "odd" to most people, or is easily mispronounced.
3) It sounds too similar to another actor or member of an acting union.
"Jaws is the Citizen Kane of movies."
blocked: logan2, Diamonds3, Hamilton22
Updated On: 6/25/06 at 12:07 PM