"Guo", written in Chinese: 郭, is one of the most common Chinese surnames and means "the wall that surrounds outside a city" in Chinese; it can also be spelled Cok, Guo, Quo, Quoc, Quach, Quock, Que, Quek, Kuo, Kok, Koc, Kwok, Kuok, Gock, Koay or Ker. The different way of spelling of this surname indicates the origin of the family. For example, "Kwok" is Cantonese originated in Hong Kong and surrounding area. It is the 18th most common family name in China. The name Guo was noted as far back as the Xia Dynasty.
Read more about Guo: Some Famous Chinese People With "郭" As The Surname