The most common way to change your last name in the US, if your a woman, is by marriage. Also many women request to have their maiden names reinstated as part of their divorce degrees. Adoption is another way. For example President Gerald Ford was born Leslie Lynch King jr. but was adopted & renamed by his mother's second husband. Nearly all men keep the same name all of their lives. In the past some immigrants would anglize their family names or change the spelling to make it easier for English-speakers to pronounce their names. Changing names seems to be more common among Jews, for example Sumner Redstone aka Murray Rothstein & Steve Wynn aka Stephen Weinberg.