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Worldwide, Grand Duke (Grandis , Grand Duke) is a rare largely male, but seldom feminine first name. The forename Grand Duke is characteristic of Indonesia, where it is a rare largely masculine, but seldom feminine name, and Italy, where it is a very rare unisex name. More prevalently, Grand Duke is the last name as well as the forename.
Grand Duke is also a name for the fictitious and mythical characters: Grandis Granva , the fictional character from Nadia: The Secret of Blue Water.