Cognomen Thoumalai (Thoumalai 
) , globally, is a very rare family name. The family name Thoumalai is habitual in South-eastern Asia, particularly Malaysia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Thoumalai | Malaysia |
Ms, Magesan, Sanmuga, Tamilarasi, and Kalaichelvi