| Czech Republic | Otýlie |
| Denmark | Carolus, Karl, Magnus |
| Estonia | Kaarel, Kaarli, Kaaro, Kalle, Karel, Karl, Karli, Karro |
| Finland | Kaarle, Kaarlo, Kalle, Mies |
| Finland-Swedish | Carla, Carola, Charlie, Kalle, Karl |
| France | Thomas |
| Hungary | Karola, Károly |
| Latvia | Kārlis, Spodris |
| Lithuania | Gedautas, Leonidas, Manfredas, Nijolė, Tomas |
| Norway | Karl, Karoline |
| Poland | Agnieszka, Augustyn, Julian, Karol, Piotr, Radomir |
| Sweden | Karl, Karla |