Goofy- He is an anthropomorphic dog and is one of Mickey Mouse's best friends. His original concept name was "Dippy Dawg" in cartoon shorts created during the 1930s; then his name was given as "George Geef" or "G.G. Geef" in cartoon shorts during the 1950s, implying that "Goofy" was a nickname. Contemporary sources, including the Goof Troop television show and A Goofy Movie, now give the character's full name to be Goofy Goof. The Goof Troop pilot also refers to 'G. G. Goof' on a diploma, likely a reference to the 1950s name. On the other hand, the comics sometimes refer to him as Goofus D. Dawg. Along with being not extremely intelligent, Goofy's main flaw is, predictably, clumsiness. His birthday is May 25, 1932.
http://disney.wikia.com/wiki/Goofy