Why does Zack Larson have a different last name than his father?

Zack Larson has a different last name than his father likely due to various personal or familial circumstances, such as his parents not being married, a legal name change, or a desire to adopt a different surname for personal reasons. This situation can arise from diverse family dynamics, including adoption or cultural factors influencing naming conventions. Each family has its own unique story that can lead to differences in surnames between parents and children.