Cognomen Lavanchy (Lavanchy 
) , around the world, is quite a rare family name. The last name Lavanchy is characteristic of Switzerland, where it is quite a rare surname, Argentina, where it is a rare surname, and France. Very seldom, Lavanchy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Lavanchy | Switzerland, Chile, United States, Argentina, France |
| jules lavanchy CH (b. 1848) |
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| ami lavanchy (1882-1965), CH (b. 1882) |
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| henri-ferdinand lavanchy Swiss entrepreneur (1926-2012), CH (b. 1926) |
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| popol lavanchy (1948-2011), CH (b. 1948) |
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| sergio lavanchy CL (b. 1943) |
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| gene lavanchy American broadcaster, US (b. 1964) |
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| pascal lavanchy figure skater, FR (b. 1968) |
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| joel l lavanchy researcher |
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| pierre lavanchy Swiss athletics competitor, CH (b. 1982) |
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| marisa lavanchy Swiss athlete, CH (b. 1990) |
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| jean-luc lavanchy |
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