Surname 淡洪 (淡洪 
) , in all the world, is a very rare cognomen. The family name 淡洪 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More prevalently, 淡洪 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 淡洪 | China |