Women often change their names when they get married.
In many cultures, children get a new name when they are baptized or as a rite of passage into adulthood. Sometimes children's names are changed when their parents get divorced. And sometimes people change their own names to mark a significant transition in their life. Perhaps you remember the furor in 1964 when Cassius Clay became Muhammad Ali as he converted from his Baptist religion to become an American Muslim. Reporters refused to acknowledge his Muslim name.