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Globally, Flavianus (Flavianus , Флавиан , Флавіан ) is a rare mostly boy's, but seldom female given name. The first name Flavianus is characteristic of Tanzania, where it is a rare male name, Indonesia, where it is a rare unisex name, and Ukraine, where it is a very rare masculine name. Measured by absolute frequency, it is the most numerous in Indonesia, Tanzania, and Russia. Very seldom, Flavianus is the last name as well as the forename.