Peter Llewelyn Davies was the middle of five sons of Arthur and Sylvia Llewelyn Davies, one of the Llewelyn Davies boys befriended and later informally adopted by J. M. Barrie. Barrie publicly identified him as the source of the name for the title character in his 1904 play Peter Pan, or The Boy Who Wouldn't Grow Up.

Arthur Llewelyn Davies was an English barrister of Welsh origin, but is best known as the father of the boys who were the inspiration for the stories of Peter Pan by J. M. Barrie.