Cognomen သိန်း (Thein 
, Sen 
, သိန်း ) , throughout the world, is a prevalent family name. The surname သိန်း is habitual in Myanmar, where it is a common surname, Mongolia, and Malaysia, where it is quite a common surname (explore the name in all countries). In absolute terms, it most frequently occurs in India, Myanmar, and Bangladesh. Very seldom, သိန်း is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thein | China, India, Bangladesh, Myanmar, Mongolia |
| Sen | China, Malaysia, India, Bangladesh, Myanmar |
| သိန်း | Myanmar |