Surname លុយ (Louis 
, លុយ 
, Luy 
) , globally, is a widespread last name. The family name លុយ is characteristic of Latin America and the Caribbean, particularly Saint Lucia, where it is a widespread surname, Haiti, where it is a common surname, and Grenada (explore the name in all countries). In absolute terms, it most frequently occurs in France, Haiti, and the United States. More prevalently, លុយ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Louis | Democratic Republic of the Congo, France, Haiti, United States, South Africa |
| លុយ | Cambodia |
| Luy | United Kingdom, France, United States, India, Indonesia |
| 鐳 | China |