| Name | Meaning | Gender | Origin |
|---|
| Orson | Little bear
| Male | Latin |
| Oscar | God's spear.
| Male | English |
| Otto | Born eighth or wealthy
| Male | |
| Owen | Young fighter
| Male | Welsh |
| Penn | enclosure | Male | English |
| Phineas | oracle; dark-skinned | Male | Hebrew |
| Ralph | Red wolf
| Male | English |
| Ralph | Red wolf
| Male | English |
| Reggie | counsel power | Male | English |
| Rex | after the Rex Banner character in The Simpsons cartoons | Male | Latin |
| Rhett | Enthusiastic, stream.
| Male | English |
| Robin | Famed: bright: shining Form of Robert popular since the medieval days of Robin Hood. Robinson: (English) Son of Robert Famed: bright: shining. Surname.
| Male | |
| Roman | citizen of Rome | Male | Latin |
| Ronnie | Victorious | Unisex | English |
| Rudy | From Rudolph - Famous wolf | Male | |
| Rufus | Red haired | Male | Latin |
| Rupert | middle name: Biggles | Male | |
| Sebastian | An august person | Male | Latin |
| Seymour | From St. Maur
| Male | English |
| Simon | he who hears | Male | Hebrew |
| Ted | English, wealthy guardian | Male | English |
| Thaddeus | Praise be to God | Male | Aramaic |
| Theo | divine gift | Male | English |
| Theodore | gift of God | Male | Greek |
| Tobias | From the Hebrew Tobiah Jah is good.
| Male | Greek |