Cognomen Caughan (Caughan 
) , in the entire world, is a very rare last name. The last name Caughan is characteristic of New Zealand, where it is a very rare surname, the United Kingdom, and the United States, where it is an extremely rare surname. Very seldom, Caughan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Caughan | New Zealand, United Kingdom, United States |