The Greek name given translates to "Legion the Jester" and is based on the official Greek dub of the anime.
The Spanish name of this monster in the videogames The Sacred Cards and Reshef of Destruction is "Legion el adicto bufón", where the word "fiend" is a synonym of "addict". In the American Spanish dub, it's known as "Legión Mago Jester". Note that it still uses the English word "jester" instead of "bufón". In the European Spanish dub, it's known as "Legión, el Bufón Malvado" ("Legion, the Evil Jester").