| Jonas (2) | | YO-nahs (German), JO-nəs (English) | Swedish, Norwegian, Danish, German, Dutch, Biblical | |
| Jonathan | | JAHN-ə-thən (English), YO-nah-tahn (German) | English, German, Swedish, Norwegian, Danish, Dutch, French, Biblical | |
| Joop | | YO:P | Dutch | |
| Joord | | YO:RT | Dutch | |
| Joos | | YO:S | Dutch | |
| Joost | | YO:ST | Dutch | |
| Jordaan | | yawr-DAH:N | Dutch | |
| Joris | | YO-ris (Dutch) | Dutch, Frisian | |
| Jos | | YAWS | Dutch | |
| Josephine | | JO-sə-feen (English), yo-ze-FEE-nə (German) | English, German, Dutch | |
| Josephus | | YO-sə-fus (Dutch) | Dutch, History | |
| Jozef | | YO-zəf (Dutch) | Slovak, Dutch | |
| Jozefien | | yo-zə-FEEN | Dutch | |
| Jozua | | YO-zuy-ah | Dutch | |
| Judocus | | - | Dutch (Archaic), Ancient Celtic (Latinized) | |