Surname 蟾 (蟾 
, Chán 
) , throughout the world, is quite a rare cognomen. The family name 蟾 is habitual in Guatemala, where it is quite a rare surname, Myanmar, where it is a rare surname, and Vietnam, where it is a very rare surname. Measured by absolute frequency, it is commonest in China, Guatemala, and Vietnam. Also, 蟾 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 蟾 | China |
| Chán | Guatemala, Ecuador, Mexico, Vietnam, Myanmar |