Lyon , however , felt that the name `` Marilyn Monroe '' was sexy , had a `` nice flow , '' and would be `` lucky '' due to the double `` M '' and thus Norma Jeane Baker took the name Marilyn Monroe . Lyon , however , felt that the name `` Marilyn Monroe '' was sexy , had a `` nice flow '' , and would be `` lucky '' due to the double `` M '' and thus Norma Jeane Baker took the name Marilyn Monroe .