Cognomen Mongar (Mongar 
) , in all the world, is quite a rare family name. The family name Mongar is habitual in Bhutan, where it is a common surname, Tunisia, where it is a rare surname, and Spain. In absolute terms, it is commonest in Bhutan, the United States, and India. Much less frequently, Mongar is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mongar | Democratic Republic of the Congo, Spain, India, Bhutan, United States |