Surname Mahadewan (Mahadewan 
) , worldwide, is a very rare cognomen. The cognomen Mahadewan is habitual in Malaysia, where it is a rare surname, and Canada, where it is an extremely rare surname. Very seldom, Mahadewan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mahadewan | India, Canada, Malaysia |