Cognomen ياركو (Jarkko 
, Jarko 
, ياركو) , worldwide, is a rare last name. The cognomen ياركو is habitual in Finland, where it is quite a rare surname, Slovakia, and Latvia, where it is a rare surname. Not in comparison with a country's population, the name is most common in Finland, Indonesia, and Slovakia. More prevalently, ياركو is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jarkko | Belgium, Sweden, Finland, United States, Austria |
| Jarko | Poland, Slovakia, Finland, United States, Indonesia |