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He is a fictional character who doesn't exist in real life. If you mean the actor who played him in the movies, Robbie Coltrane.
Rubeus Hagrid.
it was a joke you kill joy and it was and still is scruntchy fantastico
Grawp is Hagrid's half brother if your looking for specific names- but they are just referred to as a species as 'Giants' if you mean trolls then that is something different.Trolls are not as big and less intelligent.
He does not have a middle name.
Keith's middle name is Ronald.