Cognomen Maclachlan (Maclachlan 
) , worldwide, is quite a rare family name. The last name Maclachlan is characteristic of Reunion, where it is quite a common surname, New Zealand, where it is quite a rare surname, and the United Kingdom. In absolute terms, it is the most numerous in the United Kingdom, the United States, and Canada.
| VARIANT | COUNTRY |
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| Maclachlan | United Kingdom, Canada, Australia, South Africa, United States |
| lachlan maclachlan politician, died 1849 (b. 1791) |
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george galbraith maclachlan British surveyor and explorer in Australia, AU (b. 1843) |
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| george maclachlan, 21st of maclachlan (1803-1877) (b. 1803) |
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| dr john maclachlan GB (b. 1804) |
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| paul maclachlan (b. 1805) |
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jessie maclachlan British singer, GB (b. 1866) |
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| daniel maclachlan (b. 1807) |
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george maclachlan Canadian politician, CA (b. 1881) |
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glenville maclachlan Canadian politician (1895-1973), CA (b. 1895) |
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| william maclachlan, 22nd of maclachlan (1856-1881) (b. 1856) |
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| norman maclachlan English cricketer and educator (1858-1928), GB (b. 1858) |
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| john maclachlan, 23rd of maclachlan (1859-1942) (b. 1859) |
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| robert maclachlan (1860-1914) (b. 1860) |
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| george maclachlan (1864-1894) (b. 1864) |
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| thomas banks maclachlan British writer, GB (b. 1865) |
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