Cognomen มืด (Dark 
, Thedark 
, มืด 
) , all around the world, is a common last name. The last name มืด is habitual in El Salvador, where it is quite a rare surname, Syria, and Libya. Measured by absolute frequency, this name is the most popular in Indonesia, Egypt, and the United States. Also, มืด is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dark | United Kingdom, Bangladesh, United States, Egypt, Indonesia |
| Thedark | China, France, United States, Egypt, Indonesia |
| มืด | Thailand |
| Muet | France, United Kingdom, United States, Germany, Indonesia |
ชาวนา, หมันการ, and จันทร์สามเรือน