Cognomen Quain (Quain 
, 奎因 
) , around the world, is quite a rare family name. The last name Quain is characteristic of Ireland, where it is quite a rare surname, Australia, where it is a rare surname, and Ghana. Not in comparison with a country's population, it is commonest in the United States, Australia, and Ghana. Much less frequently, Quain is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Quain | Australia, Ireland, Ghana, United States, France |
| 奎因 | China |
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richard quain British surgeon and medical writer (b. 1800) |
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richard quain Irish doctor, IE (b. 1816) |
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| john richard quain Irish barrister and judge in England (b. 1796) |
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eric p. quain American physician and surgeon (1870 – 1962) (b. 1870) |
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| beatrice quain (died 1911) (b. 1856) |
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| agnes mary quain (born 1856) (b. 1856) |
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| fannie dunn quain American suffragist, US (b. 1874) |
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| edwin a. quain (1906-1975), US (b. 1906) |
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kevin quain Canadian musician, CA |
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| didier quain Belgian association football player, BE (b. 1960) |
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| noah quain Peerage person ID=390325 |
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| david quain researcher |
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| mary quain Peerage person ID=390326 |
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| richard quain Peerage person ID=637618 |
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| katharine m quain researcher |
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