Whether someone decides to change their last name upon marriage is a personal choice and can vary based on cultural, social, and individual factors. Traditionally, in many cultures, it has been common for a woman to take her husband's last name upon marriage. However, in modern times, there is a growing trend of individuals choosing to keep their own last names or hyphenating their names to include both partners' surnames.
Ultimately, the decision to change one's last name upon marriage is entirely up to the individuals involved, and there is no right or wrong choice. It's a matter of personal preference, beliefs, and the dynamics of the relationship between the partners.