U+90ED CJK Unified Ideo­graph-​90ED

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"Guo", written in Chinese: 郭, is one of the most common Chinese surnames and means "the wall that surrounds a city" in Chinese. It can also be transliterated as Cok, Gou, Quo, Quach, Quek, Que, Keh, Kuo, Kwo, Kuoch, Kok, Koc, Kwee, Kwek, Kwik, Kwok, Kuok, Kuek, Gock, Koay, or Ker. The Korean equivalent is spelled Kwak; the Vietnamese equivalent is Quách. The different ways of spelling this surname indicate the origin of the family. For example, the Cantonese "Kwok" originated in Hong Kong and the surrounding area. In the Philippines, it's "Que", "Ke", "Quepe", and "Kepa". It is the 18th most common family name in China and can be traced as far back as the Xia dynasty. There are eight legendary origins of the Guo surname, which include a Persian (Hui) origin, a Korean origin, and a Mongolian origin, as a result of sinicization. However, the majority of people bearing the surname Guo are descended from the Han Chinese.

In 2019, Guo was the 16th common surname in mainland China.