Last name Vallauthan (Vallauthan 
) , globally, is a very rare cognomen. The family name Vallauthan is habitual in Malaysia, where it is a very rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Vallauthan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Vallauthan | United States, Malaysia |