Family name 卡因 (Kain 
, 卡因 
) , around the world, is a common cognomen. The family name 卡因 is characteristic of Austria, where it is quite a rare surname, Lebanon, and Trinidad and Tobago. Not in comparison with a country's population, this name is the most popular in the United States, India, and Germany. Likewise, 卡因 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kain | Austria, Germany, United States, India, Indonesia |
| 卡因 | China |