| Czech Republic | Jakub |
| Denmark | Jacobus |
| Estonia | Jaagup, Jaak, Jaako, Jaap, Jako, Jakob, Jass |
| Finland | Jaakko, Jaakob, Jaakoppi, Jimi |
| Finland-Swedish | Jakob, Jim, Jimmy |
| France | Jacques |
| Hungary | Jakab, Kristóf |
| Latvia | Jēkabs, Žaklīna |
| Lithuania | Aušrinė, Jokūbas, Kargaudas, Kristoforas, Kristupas |
| Norway | Jack, Jakob, Jim |
| Poland | Jakub, Krzysztof, Sławosz, Walentyna |
| Sweden | Jakob |