Cognomen จันทร์ฉาย (จันทร์ฉาย 
, Janchai 
, Janchay ) , throughout the world, is quite a common family name. The family name จันทร์ฉาย is characteristic of South-eastern Asia, particularly Thailand, where it is quite a rare surname, and Myanmar, where it is a very rare surname. Also, จันทร์ฉาย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| จันทร์ฉาย | Thailand |
| Janchai | Germany, Malaysia, Singapore, United States, Thailand |
| Janchay | United States, Thailand |
| Junchai | China, Malaysia, Thailand, United States, Myanmar |
Chanchaerm, Chanchai, Chanchaingam, Chancharung, Chanchay, Chancheai, Chanchiam, Chanchiew, Chanchoncherm, Chanchuea, Chankesorn, Chanridthong, Janchanchai, Janchuea, Janechai, Janjeang, Jansawng, Janshai, Monday, Moonchaisong, and Moonchuea