Last name Ky (Ky 
, カイ 
, Ки 
) , all around the world, is a common cognomen. The family name Ky is habitual in Finland, where it is quite a common surname, Burkina Faso, and Japan. In absolute terms, it is commonest in Japan, Egypt, and Indonesia. Likewise, Ky is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ky | Burkina Faso, Vietnam, Indonesia, Egypt, Myanmar |
| カイ | Japan |
| Ки | Kazakhstan, Armenia, Russia, Belarus, Bulgaria |
| קיי | Israel |
| ky painter Ancient Attic-greek black-figure vase painter (b. 700) |
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| châu quan ky CN (b. 1895) |
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| ky pepper ewing (b. 1898) |
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| ky laffoon professional golfer, US (b. 1908) |
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| ky duyen French actor (1910-1991), FR (b. 1910) |
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patrick ky EASA CEO, FR (b. 1967) |
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ky hollenbeck kickboxer, US (b. 1987) |
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laetitia ky Ivory Coast feminist artist, CI (b. 1996) |
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| ky siriki Ivorian sculptor, CI (b. 1953) |
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| ky tech Cambodian lawyer (b. 1960) |
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| ky furneaux Australian actress, AU (b. 1973) |
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| prosper bonaventure ky BF (b. 1965) |
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| ky van ha Ph.D. Universitetet i Oslo 1988 |
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| chin-long ky researcher |
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| ky hyun chung researcher |
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