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In the entire world, Йани (Йани ) is an extremely rare unknown gender forename. Much more frequently, Йани is the last name as well as the forename.
Iani, Jani, Jjani, and Yani
Есаян, Апресян, Давтян, Еркнапешян, Мамайанян, Тандилян, Маргарян, and Ованнисян