Surname Csen (เฉิน 
, Чэнь 
, Чень 
) , all around the world, is quite a rare cognomen. The cognomen Csen is characteristic of Thailand, where it is quite a rare surname, Ukraine, where it is a rare surname, and Kyrgyzstan. Measured by absolute frequency, it is the most numerous in Thailand, Ukraine, and Russia. Very seldom, Csen is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| เฉิน | Thailand |
| Чэнь | Belarus, Kazakhstan, Kyrgyzstan, Russia |
| Чень | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Csen | Malaysia, Italy, India |