I think Harry may be a decendent of Godric Gryffindor and here are a couple of my reasons. First his parents lived in Godric's Hollow. Second Voldemort chose him over a pure-blood and we know Voldemort is a decendent of Salazar Slytherin and Slytherin and Gryffindor hated each other. Third in book two Dumbledor told Harry only a true GRYFFINDOR could have pulled out Godric's old sword. The last reason is that there is some rumor going around about the Half Blood Prince. It's about some old man who looks like a lion from all his hair. Gryffindor's house symbol is a lion, so we could be finding out the truth about Harry's ancestors.