| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 741 | Nye | Welsh | Diminutive of Aneurin: Uncertain origin, but may be derived from the Latin Honorius meaning man of honour, or from the Welsh eur meaning gold. | M | |
| 742 | Nynnyaw | Welsh | Legendary son of Beli. | M | |
| 743 | Odgar | Welsh | Legendary son of Aedd. | M | |
| 744 | Ofydd | Welsh | Welsh form of Ovid 'a Roman poet'. | M | |
| 745 | OIwyna | Welsh | White foot print. | F | |
| 746 | Ol | Welsh | Legendary son of Olwydd. | M | |
| 747 | Olwen | Welsh | White footprint. In 'Culhwch and Olwen', one of the Welsh stories from the 'Maginogion', the Olwen were white flowers growing in the heroine's footprints. | F | |
| 748 | Olwina | Welsh | White foot print. | F | |
| 749 | Olwydd | Welsh | Tracker. | M | |
| 750 | Olwyn | Welsh | Variant of Olwen: White footprint. In 'Culhwch and Olwen', one of the Welsh stories from the 'Maginogion', the Olwen were white flowers growing in the heroine's footprints. | F | |
| 751 | Ondyaw | Welsh | Legendary son of a French Duke. | M | |
| 752 | Oswallt | Welsh | Welsh form of Oswald 'strength from God'. | M | |
| 753 | Owain | Welsh | Young warrior. | M | |
| 754 | Owein | Welsh | Young warrior. | M | |
| 755 | Owen | Welsh | Young warrior. Also can be a variant of Eugene: Well-born. | M | |
| 756 | Owena | Welsh | Feminine form of Owen: Young warrior. Also can be a variant of Eugene: Well-born. | F | |
| 757 | Owin | Welsh | Young warrior. | M | |
| 758 | Owyn | Welsh | Young warrior. | M | |
| 759 | Owynn | Welsh | Wellborn. Form of Ewan. | M | |
| 760 | Padrig | Welsh | Welsh form of Patrick 'noble'. | M | |