Do adopted children keep their birth surname?

Question:

Do adopted children keep their birth surname?

Additional Details

5 months ago
thanks for the answers, i understand thats its probably not common, but is it legal. my cousin is adopted but has a different last name (adopted)

5 months ago
wow i messed up typing that completely but its not really relevant anyways. just curious if thats like legal and done sometimes (aka if child wants to keep it for some reason)

Best Answer - Chosen by Asker: 5 months ago
thanks for the answers, i understand thats its probably not common, but is it legal. my cousin is adopted but has a different last name (adopted)