Surname Louangvilay (Louangvilay 
) , in the world, is quite a rare cognomen. The family name Louangvilay is characteristic of Laos, where it is quite a common surname, Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Louangvilay | Laos, Thailand, United States |