Last name Loudon (Loudon 
, Лаудон 
, Лоудон ) , in the world, is quite a rare cognomen. The cognomen Loudon is habitual in British Virgin Islands, where it is quite a common surname, Australia, where it is quite a rare surname, and the United Kingdom. Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Australia. Very seldom, Loudon is the forename as well as the last name.
| otto gerhard loudon (b. 1673) |
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| johann reinhold von loudon (b. 1714) |
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loudon Scottish botanist (1783-1843), GB (b. 1783) |
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| john loudon (1751-1835) (b. 1751) |
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j.w.loudon English science fiction writer and botanist (1807-1858), GB (b. 1807) |
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john francis loudon (1821-1895), NL (b. 1821) |
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james loudon Dutch East Indies statesman, NL (b. 1824) |
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| loudon harcourt gordon (born 1780) (b. 1780) |
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| eliza eleanor loudon (born 1784) (b. 1784) |
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| alexander loudon (1789-1839) (b. 1789) |
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james loudon Canadian physicist, CA (b. 1841) |
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| charles loudon Scottish medical writer, FR (b. 1801) |
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hugo loudon Dutch entrepreneur, NL (b. 1860) |
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joseph h. loudon politician in Massachusetts, US, US (b. 1861) |
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john loudon Dutch minister of Foreign Affairs, diplomat and politician (1866-1955), NL (b. 1866) |
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