Who coined the term "artificial intelligence"?
Based on my research, there is no conclusive answer as to who coined the term, although McCarthy can be credited with helping the term to find widespread acceptance within the computer science community. See "AI: The Tumultuous History of the Search for Artificial Intelligence" by Daniel Crevier (Published in 1993 by BasicBooks):

"Overcoming the resistance of some participants (Samuel felt that "artificial" sounded phony, and Newell and Simon persisted in calling their work "complex information processing" for years afterward), McCarthy persuaded the majority to go for "artificial intelligence." He lays no claim to having coined the phrase, and admits it may have been used casually beforehand. Yet nobody denies him the achievement of getting it widely accepted."

-- Daniel Crevier, p.50