The following list includes all of the official names of New Prussia in their respective languages. Any of these names can be used within the sovereign state.
English - Grand Duchy of New Prussia
German - Großherzogtum New Preußen
Danish - Storhertugdømmet Ny Preussen
Swedish - Storhertigdömet Nya Preussen
Norwegian - Storhertugdømmet Nye Preussen
French - Grand-Duché de Prusse Nouveau