Cognomen Lacas (Lacas 
) , throughout the world, is quite a rare family name. The last name Lacas is habitual in Reunion, where it is quite a common surname, France, where it is a rare surname, and Canada. In absolute terms, it most frequently occurs in France, Philippines, and Canada. Much less frequently, Lacas is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Lacas | France, Canada, Philippines, United States, Reunion |
| emile lacas CA (b. 1866) |
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| frédéric lacas French politician, FR (b. 1959) |
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| martine lacas French art historian and scholar, FR (b. 1964) |
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| françois lacas Ph.D. École Centrale 1989, FR |
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| benjamin lacas researcher ORCID ID = 0000-0003-4416-5950 |
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| stéphane lacas cyclist, MG (b. 1982) |
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| marie eve lacas |
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