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All over the world, ארנושט (Arnošt , ארנושט ) is quite a rare masculine given name. The forename ארנושט is characteristic of Czechia, where it is quite a common boy's name, Slovakia, where it is a rare boy's name, and Austria. In absolute terms, it is commonest in Eastern Europe, particularly Czechia, Slovakia, and Poland. Very seldom, ארנושט is the last name as well as the forename.
ארנושט is also a name for the fictitious and mythical characters: Dj Arnoštek , character in Kouř.