Cognomen Harlan (Harlan 
, 哈伦 
, Харлан 
) , throughout the world, is a common surname. The surname Harlan is characteristic of Belarus, where it is quite a rare surname, the United States, and Ukraine. Not in comparison with a country's population, it is the most numerous in the United States, Indonesia, and Ukraine. Also, Harlan is the forename as well as the last name.
| joshua harlan 15 Nov 1696/1697 in Pennsylvania - Bef 13 Jul 1744 (date will probated) (b. 1696) |
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| joseph harlan 17 May 1723 Kennet Township, Pennsylvania - 22 Dec 1803 Kennet Township, Pennsylvania (b. 1723) |
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richard harlan American zoologist (1796-1843), US (b. 1796) |
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josiah harlan American mercenary, US (b. 1799) |
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james harlan American politician and lawyer (1800-1863), US (b. 1800) |
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aaron harlan American politician, US (b. 1802) |
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| joshua harlan 24 Mar 1754 Kennet Township, Pennsylvania - 26 Mar 1823 Kennet Township (b. 1754) |
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| silas harlan US (b. 1753) |
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andrew j. harlan American politician (1815-1907), US (b. 1815) |
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robert james harlan politician (1816-1897), US (b. 1816) |
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james harlan American politician (1820-1899), US (b. 1820) |
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| samuel harlan 20 Jul 1775 Kennet Township, Pa. - 3 May 1860 Concord, Delaware (b. 1775) |
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john marshall harlan US Supreme Court justice from 1877 to 1911 (1833-1911), US (b. 1833) |
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george c. harlan American ophthalmologist (b. 1835) |
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mary eunice harlan wife of Robert T. Lincoln, US (b. 1846) |
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