Cognomen Mainn (Mainn 
) , all over the world, is a rare last name. The surname Mainn is characteristic of Myanmar, where it is a rare surname, Thailand, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in Myanmar, Thailand, and India. Very seldom, Mainn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mainn | United Kingdom, Myanmar, Malaysia, Thailand, India |