Gregory Goyle (b. 1979/1980) was a pure-blood wizard in the same year as Harry Potter at Hogwarts School of Witchcraft and Wizardry. He was sorted into Slytherin House. Goyle was the son of a Death Eater and his wife. It is unknown if he is a Death Eater as well.
Goyle, along with fellow Slytherin Vincent Crabbe, seemed to already be best friends with Draco Malfoy before their first year at Hogwarts. Both wizards were shown to be more lackeys than friends, often following Malfoy around and doing his bidding.