Whats the name of the big hairy fat guy in harry potter? He's harry's friend.
You are referring to Rubeus Hagrid played by Robbie Coltrane.
Robbie Coltrane was born in Rutherglen, South Lanarkshire, Scotland, on March 30, 1950. He became recognized in the United Kingdom for his cameo performances in such films as Mona Lisa and Henry V. Coltrane continues to appear in films, enjoying great success in such family films as The Adventures of Huckleberry Finn and the Harry Potter series, in which he plays the kindly gamekeeper Rubeus Hagrid the Giant.
Of interest, Robbie Coltrane is included in the upcoming film Effie Gray, set for release in October 2013.