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Family name グオ (グオ ) , all around the world, is an extremely rare cognomen. Much more frequently, グオ is the forename as well as the last name.
Gou, Guo, Koeh, Kuo, Kwok, Quach, Quách, Го, Гуо, Куо, قو, 郭, 郭氏, and 곽