Last name 凯恩 (Kaine 
, Kayne 
, 凯恩 
) , around the world, is quite a rare family name. The last name 凯恩 is habitual in Liberia, where it is quite a rare surname, Estonia, and Senegal, where it is a rare surname. In absolute terms, this name is the most popular in the United States, Nigeria, and China. Also, 凯恩 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kaine | Australia, Nigeria, United States, Japan, Democratic Republic of the Congo |
| Kayne | Australia, United Kingdom, United States, Japan, Indonesia |
| 凯恩 | China |
| Kaehn | Canada, United States, Germany |