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Last name Иасон (Iason , Yason , Iasson ) , in all the world, is quite a common cognomen. The last name Иасон is characteristic of Georgia, where it is quite a common surname, Greece, and Japan, where it is quite a rare surname. Likewise, Иасон is the forename as well as the last name.
Гвенетадзе, and Гобеджишвили