Family name Longdoi (Longdoi 
) , across the world, is a very rare cognomen. The cognomen Longdoi is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, Longdoi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Longdoi | India, Thailand |
Rongtiwa, Rungtiwa, and Jittrawadee