Cognomen Manthai (Manthai 
) , throughout the world, is a very rare family name. The last name Manthai is characteristic of Germany, where it is a very rare surname, South Africa, where it is an extremely rare surname, and Brazil. In absolute terms, this name is the most popular in Germany, India, and Brazil. Also, Manthai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Manthai | South Africa, India, Brazil, Germany, United States |