Surname จันทร์เจ้า (Chanchao 
, Janchao , จันทร์เจ้า) , worldwide, is a very rare family name. The cognomen จันทร์เจ้า is characteristic of Thailand, where it is a rare surname, and Brazil, where it is an extremely rare surname. More prevalently, จันทร์เจ้า is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Chanchao | Thailand, China, Brazil, India, Laos |
| Janchao | Thailand |
Chuntrkhao, Monday, and Unchanthee