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Nomenclature
His surname, 高城 Takajō, literally translates to "high castle," derived from 高き所にある館 takaki tokoro ni aru yakata (the dwelling on high). His first name ゼット Zetto, is the Japanese pronunciation of the English letter Z, short for his true name "Zebul." This is ultimately a reference to 高き館の主 Takaki Yakata no Shu (Lord of the High Dwelling), which is the literal meaning of Baal Zebul, the god from whom Beelzebub is derived.