Last name โกศัลย์ (Kosan 
, โกศัลย์ 
) , in the world, is quite a rare cognomen. The family name โกศัลย์ is characteristic of Myanmar, where it is quite a rare surname, Czechia, and Slovenia. Not in comparison with a country's population, this name is the most popular in Japan, Myanmar, and India. More frequently, โกศัลย์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kosan | Japan, Myanmar, Germany, India, Indonesia |
| โกศัลย์ | Thailand |