| Jak | yak |
| Jakob | Jacob James |
| Jakute | Yakut |
| Jakarta | Jakarta |
| Jakobus | James |
| Jakutsk | Yakutsk |
| Jakobite | Jacobite |
| Jakutien | Yakutia |
| Kajak | kayak |
| Jakobitin | Jacobite |
| Jakobsweg | Way of St James |
| Jaktation | jactation |
| Jakutisch | Yakut Sakha |
| Jakobsstab | Orion's Belt bourdon Jacob’s staff |
| Muntjak | muntjac muntjak |
| Ejakulat | ejaculate |
| Guajaköl | guaiac oil |
| Jakobskirche | St James's Church |
| Jakobsleiter | Jacob's Ladder rope ladder Jacob's ladder |
| Präejakulat | pre-ejaculate |