Family name Monlouis (Monlouis 
) , throughout the world, is a rare cognomen. The surname Monlouis is habitual in Saint Lucia, where it is quite a common surname, France, where it is a rare surname, and the United Kingdom, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in France, Saint Lucia, and the United States. Very seldom, Monlouis is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Monlouis | Germany, Saint Lucia, France, United States, United Kingdom |
| claude monlouis French actor, FR (b. 1947) |
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| jessy monlouis bonnaire FR (b. 1984) |
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| kieran monlouis English football player (born 1995), GB (b. 1995) |
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