Answer: Aggies
In 1925, when Michigan Agricultural College was renamed Michigan State College, the college had a contest to replace the old nickname of "Aggies". The nickname Michigan Staters was chosen. George S. Alderton (sports editor of the Lansing State Journal), decided the name was not good for newspaper writing and he wanted to find a better one. Alderton found "Spartans" in the left over contest entries and selected that one. Unfortunately, he forgot to write down the name on the entry, so no one knows who really came up with the nickname.