Family name 鸿冈 (鸿冈 
) , globally, is a very rare last name. The last name 鸿冈 is characteristic of Eastern Asia, particularly China, where it is an extremely rare surname. More frequently, 鸿冈 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 鸿冈 | China |