Cognomen Klacka (Klacka 
) , all around the world, is a very rare last name. The cognomen Klacka is habitual in Czechia, where it is a rare surname, Argentina, where it is an extremely rare surname, and Germany. Measured by absolute frequency, the name is most common in Czechia, the United States, and Argentina.
| VARIANT | COUNTRY |
|---|---|
| Klacka | Germany, Czechia, United States, Argentina, Brazil |