Surname หลุยส์ (Lui 
, Louisa 
, Louy 
) , in the world, is a common family name. The family name หลุยส์ is habitual in Hong Kong, where it is a common surname, Bermuda, and Cayman Islands (explore the name in all countries). In absolute terms, this name is the most popular in Hong Kong, China, and Malaysia. Likewise, หลุยส์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Lui | China, United States, Hong Kong, Taiwan, Malaysia |
| Louisa | Democratic Republic of the Congo, China, United States, Hong Kong, South Africa |
| Louy | United Kingdom, Democratic Republic of the Congo, United States, Australia, Taiwan |
| หลุยส์ | Thailand |