Cognomen Maclagan (Maclagan 
) , in all the world, is a rare family name. The last name Maclagan is characteristic of Australia, where it is a rare surname, the United Kingdom, and Canada, where it is a very rare surname. In absolute terms, the name is most common in the United States, the United Kingdom, and Australia. Very seldom, Maclagan is the forename as well as the last name.
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| Maclagan | United Kingdom, Australia, United States, South Africa, Canada |
| james maclagan British minister, GB (b. 1728) |
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david maclagan Scottish doctor and military surgeon (1785-1865), GB (b. 1785) |
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douglas maclagan Scottish surgeon (1812-1900), GB (b. 1812) |
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robert maclagan British Army officer and military engineer (1820–94) (b. 1820) |
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| jean maclagan politician (b. 1770) |
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william maclagan Archbishop of York 1826-1910, GB (b. 1826) |
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bill maclagan Scottish rugby union player (1858-1926), GB (b. 1858) |
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| christian maclagan British antiquary and archaeologist, GB (b. 1811) |
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edward douglas maclagan British colonial administrator (b. 1864) |
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| robert maclagan (1820-1893) (b. 1820) |
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| david maclagan (1824-1883) (b. 1824) |
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eric maclagan British art historian (b. 1879) |
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| thomas john maclagan British doctor and pharmacologist, GB (b. 1838) |
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| robert craig maclagan (b. 1839) |
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myrtle maclagan cricketer (1911-1993), IN (b. 1911) |
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