What was Casper the Friendly Ghosts surname?

Casper the Friendly Ghost is a fictional character and the protagonist of the Famous Studios theatrical animated cartoon series of the same name. As his name indicates, he is a ghost, yet he is quite personable. According to the 1995 feature film Casper, his family name is McFadden, making his "full" name Casper McFadden.

Casper was created in the late 1930s by Seymour Reit and Joe Oriolo, the former devising the idea for the character and the latter providing illustrations. Intended initially as the basis for a 1939 children's storybook, there was at first little interest in their idea. When Reit was away on military service during the Second World War before the book was released, Oriolo sold the rights to the book to Paramount Pictures' Famous Studios animation division.