Cognomen Geng (Gang 
, Geng , 金恩 ) , globally, is a widespread surname. The cognomen Geng is habitual in Cayman Islands, where it is quite a common surname, China, and Bermuda (explore the name in all countries). Measured by absolute frequency, this name is the most popular in China, India, and Indonesia. Much less frequently, Geng is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Geng, Gang | Indonesia, Taiwan, China, India, Malaysia |
| 金恩 | China |
| Генг | Belarus, Ukraine, Russia, Kyrgyzstan, Kazakhstan |
| geng yan Eastern Han dynasty general (b. 3) |
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| geng bing Eastern Han dynasty general (b. 35) |
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| geng guo Eastern Han dynasty general (b. 50) |
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| geng kuang Eastern Han dynasty general (b. 50) |
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| geng ji (b. 218) |
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| geng wenxun Tang dynasty person CBDB = 139222 (b. 590) |
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| geng ciai person, CBDB = 140131 (b. 636) |
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| geng shi wife of Fang Fu Jun (Geng Shi Fu) (b. 704) |
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| geng yong Tang dynasty person CBDB = 142097 (b. 796) |
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| geng zongyi Tang dynasty person CBDB = 143660 (b. 823) |
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| geng shi mother of Zhao Tingmei (b. 950) |
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| geng chongcong Song dynasty person CBDB = 19371 (b. 979) |
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geng ding King of the Shang dynasty of China (b. 1200) |
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| geng fu Yuan dynasty person CBDB = 105835 (b. 1167) |
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| geng fuheng Yuan dynasty person CBDB = 117784 (b. 1224) |
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