Last name Hain (Hain 
, 海恩 , خائن 
, among others...) , globally, is a common cognomen. The surname Hain is habitual in Reunion, where it is quite a common surname, Germany, where it is quite a rare surname, and Myanmar. Not in comparison with a country's population, the name is most common in Germany, Myanmar, and the United States. Likewise, Hain is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Hain | Philippines, Myanmar, United States, China, Germany |
| 海恩 | China |
| خائن | Iraq, Egypt, Sudan, Yemen, Morocco |
| Хаин | Russia |
| Хайн | Kazakhstan, Russia, Ukraine |
| catharina hain (b. 1557) |
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| katharina hain (b. 1557) |
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| margareta-catharina hain (b. 1592) |
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| samuel hain (b. 1605) |
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| johann paterson hain (b. 1615) |
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| freiherr johann caspar von bicken zum hain 1662 Erfurt - 24 Feb 1717 Tauberbischofsheim (b. 1662) |
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| freiin maria franziska philippine von bicken zum hain 1699 - 19 Feb 1772 Mainz (b. 1699) |
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| serapion hain (1748-1801), AT (b. 1748) |
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| anton hain (b. 1763) |
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| ludwig hain German editor (1781-1836), DE (b. 1781) |
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frank k. hain American railroad executive (1836–1896), US (b. 1836) |
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| josef hain (1809-1852), CZ (b. 1809) |
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| adolf hain (b. 1825) |
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hain péter Hungarian detective and police officer (1895-1946), HU (b. 1895) |
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| edward hain British politician, GB (b. 1851) |
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