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Last name Kera (Kera , Кера , كيرا ) , worldwide, is a common surname. The last name Kera is characteristic of Bulgaria, where it is quite a common surname, Japan, and Luxembourg, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Japan, India, and Bulgaria. Likewise, Kera is the forename as well as the last name.