| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 41 | Uftzi | Basque | Sky. | M | |
| 42 | Ugutz | Basque | Name for John the Baptist. | M | |
| 43 | Unai | Basque | Shepherd. | M | |
| 44 | XabieF | Basque | Owns a new house. | M | |
| 45 | Xanti | Basque | Named for Saint James. | M | |
| 46 | Xavier | Basque | Owns a new house. | M | |
| 47 | Ximon | Basque | God is heard. | M | |
| 48 | Ximun | Basque | God is heard. | M | |
| 49 | Yoau | Basque | God saves. | M | |
| 50 | Yuli | Basque | Youthful. | M | |
| 51 | Zadornin | Basque | Saturn. | M | |
| 52 | Zigor | Basque | Punishes. | M | |
| 53 | Zorion | Basque | Happy. | M | |