Surname Caher (Caher 
) , globally, is a very rare cognomen. The cognomen Caher is characteristic of Lithuania, where it is a rare surname, Ireland, and the United States, where it is an extremely rare surname. In absolute terms, it is the most numerous in India, the United States, and Ireland. Also, Caher is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Caher | Ireland, Spain, India, Lithuania, United States |