It is the 18th most common family name in China. The name Guo was noted as far back as the Xia Dynasty, see Guo Zhi
Some famous Chinese people with "郭" as the surname:
*Guo Ziyi , general of Tang China who ended the Anshi Rebellion
*Guo Kan, a famed Chinese general that served under the Mongols.
*Guo Songtao The first Chinese minister to a western country
*Terry Gou, Taiwan Billionaire, 148th richest in the world
*Xiaolu Guo, author
*Aaron Kwok, a Hong Kong singer, actor.
*Kenix Kwok, a Hong Kong actor.
*, Hong Kong Billionaire
*Robert Kuok, Malaysia born , Hong Kong Billionaire
*Kwek Leng Beng, Singapore Billionaire, 3rd richest in South-east Asia
*Quek Leng Chan, Malaysia Billionaire, 4th richest in South-east Asia, cousin of Kwek Leng Beng
*Guo Xuan Tong
*Patrick S Kwok, Former Mayor of Cupertino, California