| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Gwrtheyrn | - | Ancient Celtic | ||
| Haerviu | - | Ancient Celtic | ||
| Iodocus | - | Ancient Celtic (Latinized) | ||
| Iudicael | - | Ancient Celtic | ||
| Iudocus | - | Ancient Celtic (Latinized) | ||
| Jodocus | yo-DO-kəs (Dutch) | Dutch (Archaic), Ancient Celtic (Latinized) | ||
| Judoc | - | Breton, Ancient Celtic | ||
| Judocus | - | Dutch (Archaic), Ancient Celtic (Latinized) | ||
| Lugubelenus | - | Ancient Celtic | ||
| Morcant | - | Ancient Celtic | ||
| Nechtan | - | Irish Mythology, Ancient Celtic | ||
| Ninian | - | Scottish, Irish, Ancient Celtic | ||
| Nynniaw | - | Ancient Celtic | ||
| Seisyll | - | Ancient Celtic | ||
| Teutorigos | - | Ancient Celtic |