Daikatana is an Akaviri weapon. "Daikatana" is a word from the Akaviri language, not from Japanese. It sounds Japanese by pure coincidence.
—General Elder Scrolls Weaseling, The Imperial Library
The origin of the Daikatana comes from an old Dungeons and Dragons campaign run by iD tech when John Romero was employed there. The Daikatana was a very powerful legendary sword, which Romero obtained and destroyed the world with.
—Daikatana, Daikatana Wiki
Marik: Because the fate of the world depends on it, Aibou!
Bakura: What the bloody hell does 'aibou' mean?