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Last name Gellius (Гелий , Геллий , Gellius ) , around the globe, is a very rare cognomen. The surname Gellius is characteristic of Belarus, where it is a rare surname, Kyrgyzstan, where it is a very rare surname, and Ukraine. Measured by absolute frequency, it is the most numerous in Eastern Europe, particularly Belarus, Ukraine, and Russia. Much more prevalently, Gellius is the forename as well as the last name.