Family name Lagache (Lagache 
) , in the entire world, is quite a common last name. The cognomen Lagache is characteristic of France, where it is quite a rare surname, Belgium, and Mauritius. Measured by absolute frequency, it is the most numerous in France, Belgium, and Argentina. Very seldom, Lagache is the forename as well as the last name.
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| Lagache | Mauritius, Belgium, United States, Argentina, France |
| célestin lagache French politician, FR (b. 1809) |
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| mathilde lagache Belgian painter, watercolorist, and pastellist, BE (b. 1814) |
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andré lagache racing driver, FR (b. 1885) |
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| julien lagache French politician, FR (b. 1837) |
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micheline lagache FR (b. 1920) |
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| alfred lagache French carom billiards player (1889–1971), FR (b. 1889) |
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| capitaine lagache FR (b. 1886) |
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| daniel lagache French psychiatrist and psychoanalyst, FR (b. 1903) |
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| victor lagache Born 20 January 1912, in Tourcoing; died 5 December 1997, in Bolbec (Seine-Maritime). French, Painter, draughtsman, watercolourist. Figure..., FR (b. 1912) |
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| georges lagache FR (b. 1916) |
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| jean lagache French actor (1931-2018), FR (b. 1931) |
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| roger lagache French politician, FR (b. 1932) |
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| elie lagache French politician, FR (b. 1946) |
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| agnès lagache FR (b. 1945) |
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| jérôme lagache French politician, FR (b. 1958) |
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