Surname Ngoạn (Ngoạn 
) , in all the world, is a very rare cognomen. The family name Ngoạn is habitual in South-eastern Asia, particularly Vietnam, where it is a very rare surname. Much less frequently, Ngoạn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ngoạn | Vietnam |