| Rocats | One who dwells by the rocks. |
| Rocatus | A name meaning rocky ground. |
| Rochadh | A field or a fenced area. |
| Rogen | A name meaning redhaired. |
| Rogue | One who is wild and untamed. |
| Roibart | Bright Fame; Shining Fame |
| Roibhilin | A small and spirited soul. |
| Romek | Derived from Roman, meaning from Rome or of noble birth. |
| Ronain | A name meaning little seal. |
| Rooghan | Reddish Land; Red Haired |
| Roslea | Meadow of the wild roses. |
| Rossin | A small headland or point. |
| Rownun | Derived from a redhaired one. |
| Ruadan | Meaning little redhaired one. |
| Ruadh | A name meaning red or ruddy. |
| Ruaidhrigh | Red; Fame Ruler |
| Ruaidre | Meaning the redhaired king. |
| Ruaidri | A name meaning redhaired king. |
| Ruairc | Meaning the famous red ruler. |
| Ruisin | A name meaning little rose. |
| Ruissine | A small, rushing stream. |
| Rumann | Early Irish Poet |
| Rusheen | A small, wooded area. |
| Ryun | A king or a little ruler. |
| Raadhee | Happy or fortunate |
| Raahimeen | Merciful or compassionate |
| Rabiullah | Lover of Allah, a name with Arabic origin meaning devotion to God. |
| Rafinur | Beautiful, a name with Arabic origin meaning something or someone lovely. |
| Raghibun | Aspirer, a name with Arabic origin meaning someone who strives for something. |
| Rahayim | Merciful, a name with Arabic origin meaning compassionate and kind. |
| Raheim | Kind, a name with Arabic origin meaning gentle and benevolent. |
| Rawaha | Pleased; Fragrance |
| Razaak | Gift of God, a name with Arabic origin meaning a blessing from Allah. |
| Razdan | Wise, a name with Arabic origin meaning intelligent and discerning. |
| Reedan | Gentle, a name with Arabic origin meaning soft and kind. |
| Rekibul | Gift of God, a name with Arabic origin meaning a blessing from Allah. |
| Reyman | Wise, a name with Arabic origin meaning intelligent and discerning. |
| Rezzak | Gift of God, a name with Arabic origin meaning a blessing from Allah. |
| Riazuddin | Gift of God, a name with Arabic origin meaning a blessing from Allah. |
| Ridhuan | Pleaser, a name with Arabic origin meaning someone who brings joy. |