Khan (surname)

Hey there kiddo! So, a surname is something that people have in their name that tells us which family they belong to. Just like how you have a last name, like Smith or Jones.
Now, Khan is a surname that is commonly found in some parts of the world, like in the Middle East and South Asia. It is usually used by people who belong to a Muslim family, which means that they follow a religion called Islam. The word "Khan" actually means "leader" or "ruler" in some languages spoken in those areas.
So, if someone's last name is Khan, it means that their family comes from a certain area and they are most likely Muslim. It's just one way to tell people apart and learn a little bit about their background.