Surname Lansdown (Langet 
, Lansdown 
) , in all the world, is quite a rare family name. The family name Lansdown is characteristic of Guernsey, where it is quite a common surname, Australia, where it is quite a rare surname, and New Zealand, where it is a rare surname. In absolute terms, the name is most common in the United States, the United Kingdom, and Australia. Very seldom, Lansdown is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Langet | France, Argentina, United States, Indonesia, Malaysia |
| Lansdown | Australia, South Africa, France, United Kingdom, United States |
| lansdown guilding British clergyman and naturalist (1797-1831), GB (b. 1797) |
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| henry venn lansdown (b. 1806) |
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| albert lansdown cricketer (1897-1979), AU (b. 1897) |
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| harold lansdown cricketer (1900-1957), AU (b. 1900) |
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| bob lansdown Australian public servant, AU (b. 1921) |
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| john lansdown British computer graphics pioneer, GB (b. 1929) |
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| peter lansdown Welsh ornithologist (b. 1947) |
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| stephen lansdown British businessman, GG (b. 1952) |
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| andrew lansdown (b. 1954) |
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| richard lansdown (b. 1961) |
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| gwenllian lansdown Welsh chief executive and former councillor (born 1979), GB (b. 1979) |
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| richard lansdown botanist |
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| karen lansdown researcher (ORCID 0000-0003-3242-0889) |
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| jason lansdown college basketball player (1993–1996) Radford |
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| drew lansdown researcher (ORCID 0000-0001-8086-6776) |
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