| Latin | English | Esperanto |
|---|---|---|
| Xanthium | burr | ksantio |
| Xanthorrhoea australis | grass tree | ksantoreo ; gresarbo |
| Xanthosoma sagittifolium | tarua | ksantosomo |
| Xantium occidentale | noogoora burr | purpurtiga ksantio |
| Xantium spinosum | bathurst burr | flavflora ksantio |
| Xenicus | wren | kseniko |
| Xenicus gilviventris | bush wren | blondventra kseniko |
| Xenicus longipes | rock wren | grizventra kseniko |
| Xenorhynchus asiaticus | jabiru | jabirua ; cikonio |
| Xiphias gladius | swordfish | glava ksifio |