Surname Sinkuan (Sinkuan 
) , around the world, is a very rare last name. The last name Sinkuan is characteristic of Indonesia, where it is a very rare surname, and India, where it is an extremely rare surname. Very seldom, Sinkuan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sinkuan | India, Indonesia, United States |