I can't supply all of the names here .. (exasperated and short, 'cause of the mugginess)
D - (The) Dude, "The Big Lebowski"
N - Nacho, "Nacho Libre"
R - Ron Burgundy, "Anchorman: The Legend of Ron Burgundy"
updated board:
guesses still left: A, B, C, F, H, J, K, M, O, P, Q, S, U, X