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Around the globe, Sinjiu (Sinjiu ) is an extremely rare unknown gender forename. Much more prevalently, Sinjiu is the last name as well as the forename.
Aragi, Araki, Arashiro, Arasiro, Niiki, Niishiro, Shingi, Shinjo, Shinjoh, Singi, Sinjo, Sinjou, Араги, Араки, あらき, 新城, 辛久, 辛九, and 辛玖