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Worldwide, 證 (證 ) is an extremely rare unknown gender first name. Also, 證 is the last name as well as the forename.
Akira, Sheng, Zheng, Акира, Акіра, أكيرا, アキラ, 亞基拉, 亨, 享, 亮, 光, 公, 叡, 启, 周, 哲, 啓, 啟, 彬良, 彰, 彰良, 徹, 憲, 斌, 旦, 旭, 旻, 昌, 明, 明良, 昭, 昭良, 昶, 晃, 晄, 晟, 晶, 智, 暁, 朗, 東, 滉, 玲, 璋, 症, 皓, 睿, 秋良, 章,