Family name Lacoss (Lacoss 
) , in all the world, is a rare last name. The surname Lacoss is habitual in the United States, where it is a rare surname, Israel, where it is a very rare surname, and Canada. Measured by absolute frequency, it is the most numerous in the United States, Israel, and France.
| VARIANT | COUNTRY |
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| Lacoss | United Kingdom, Canada, United States, Israel, France |
| louis lacoss American journalist (1890-1966), US (b. 1890) |
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mike lacoss American baseball player, US (b. 1956) |
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