Cognomen Kaarle (Карло 
, カール 
, Kaarle 
) , around the world, is a rare surname. The cognomen Kaarle is habitual in Sweden, where it is a rare surname, Ukraine, and Bulgaria. Measured by absolute frequency, the name is most common in Japan, Ukraine, and Russia. More prevalently, Kaarle is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Карло | Kazakhstan, Ukraine, Bulgaria, United States, Russia |
| カール | Japan |
| Kaarle | Norway, United States, Sweden, India, Finland |