| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 561 | Nuallan | Gaelic | Famous. | M | |
| 562 | Nygel | Gaelic | Champion From the Irish and Scottish Niall. | M | |
| 563 | Odharnait | Gaelic | Pale. | M | |
| 564 | Odran | Gaelic | Pale. | M | |
| 565 | Oran | Gaelic | Pale. | M | |
| 566 | Oren | Gaelic | Pale. | M | |
| 567 | Orin | Gaelic | Pale. | M | |
| 568 | Orran | Gaelic | Pale. | M | |
| 569 | Orren | Gaelic | Pale. | M | |
| 570 | Orrin | Gaelic | Pale. | M | |
| 571 | Padruig | Gaelic | Gaelic form of Patrick. | M | |
| 572 | Parthalan | Gaelic | Son of the furrows. | M | |
| 573 | Peadar | Gaelic | Gaelic form of Peter. | M | |
| 574 | Phelan | Gaelic | Little wolf. | M | |
| 575 | Piaras | Gaelic | Rock. | M | |
| 576 | Pol | Gaelic | Little. | M | |
| 577 | Proinsias | Gaelic | Frank. | M | |
| 578 | Quade | Gaelic | From the Scottish clan name McQuade. | M | |
| 579 | Quigley | Gaelic | Distaff. | M | |
| 580 | Quin | Gaelic | Counsel. Variant of Quinn. | M | |