Family name สุนิธิ (Suniti 
, Sunithi 
, สุนิธิ ) , in the world, is quite a rare cognomen. The cognomen สุนิธิ is habitual in South-eastern Asia, particularly Indonesia, where it is a rare surname, Thailand, and Malaysia, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Indonesia, India, and Thailand. Much more prevalently, สุนิธิ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Suniti | Indonesia, Nepal, India, Bangladesh, Thailand |
| Sunithi | India, United States, United Kingdom, Thailand |
| สุนิธิ | Thailand |