Cognomen 淡墨 (淡墨 
, Tan-Mo 
) , all around the world, is a very rare surname. The family name 淡墨 is habitual in South-eastern Asia, particularly Philippines, where it is a very rare surname. More frequently, 淡墨 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 淡墨 | China |
| Tan-Mo | Philippines |