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All around the world, せい (せい) is an extremely rare unknown gender given name.
Cheng, Chéng, Hoshi, Jo, Joh, Jou, Jō, Mori, Sakae, Sakai, Sakan, Sakari, Sei, Sheng, Shigeru, Shing, Sho, Shoh, Shou, Shèng, Shō, Sigeru, Syo, Syoh, Syou, Tcheng, Thành, Šeng, Šó, Мори, Сакаи, Сакан, Сакари, Сигэру, Чэн, Шэн, さかい, しげる, じょう, シェン, セイ, チェン, 成, 成氏, 星, 淸, 清, 盛, 誠, 诚, and
せい is also a name for the fictitious and mythical characters: Zhang Qing , the Water Margin character (Featherless Arrow); Cao Zheng , the Water Margin character; Song Qing , the Water Margin character; Wang Zheng , the Water Margin character and Sei Asagiri , the fictional character from VA-11 HALL-A: "devoted Valkyrie of the White Knights, a band of para-military enforcers keeping the tenuous peace in Glitch City".