Family name كاهان (Kahan 
, Cahan 
, كاهان) , across the world, is a common cognomen. The cognomen كاهان is habitual in Western Asia, particularly Oman, where it is quite a common surname, Saudi Arabia, and Qatar, where it is quite a rare surname. In absolute terms, it most frequently occurs in the United Kingdom, India, and Saudi Arabia. Likewise, كاهان is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kahan | Bangladesh, United Kingdom, India, Japan, Saudi Arabia |
| Cahan | United States, Israel, United Kingdom, India, Turkey |