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Surname Xigai (Xigai ) , worldwide, is an extremely rare cognomen. Much more frequently, Xigai is the forename as well as the last name.
喜改, 喜该, 夕改, 夕芥, 希改, 希盖, 细改, 膝盖, 膝蓋, 西改, and 锡概
Lin, and Liu