Why does Kristen Stewart and Booboo Stewart have the same last name?

Kristen Stewart and Booboo Stewart share the same last name due to a common family background, as they are not directly related. They both have Scottish ancestry, which is where the surname "Stewart" originates. However, Booboo Stewart is actually the younger brother of actress Fivel Stewart, who is Kristen Stewart's friend, contributing to their connection in the entertainment industry.