I took my first husband's name because my maiden name was so common that that it caused problems at the bank and doctor's office. I kept first husband's name for years after marrying second husband because my career was bound up it in. No longer pursuing that career, I've taken second husband's name. One family, one last name is simpler if nothing else.
If there is a god, I want to believe that there is a god. If there is not a god, I want to believe that there is no god.