| Name | Meaning | Gender | Origin |
|---|
| Margo | Pearl | Female | English |
| Margot | Variant of Margaret | Female | |
| Marguerite | Pearl | Female | |
| Mason | Worker in stone. | Male | English |
| Meaghan | Pearl | Unisex | English |
| Megan | mighty, strong able, pearl | Female | English |
| Micah | who is like the Lord | Male | Hebrew |
| Moonstone | | Unisex | |
| Nell | Abbreviation of Eleanor shining light.
| Female | English |
| Nelly | Abbreviation of Eleanor shining light.
| Male | English |
| Obsidian | | Unisex | |
| Oliver | The olive tree. The biblical olive tree symbolizes fruitfulness and beauty and dignity. Extending an olive branch signifies an offer of peace.
| Male | Latin |
| Onyx | A gemstone with bands of different colours. | Male | |
| Opal | Australian gemstone of remarkable colours, usually red, blue or green | Female | Sanskrit |
| Opal | Australian gemstone of remarkable colours, usually red, blue or green | Female | Sanskrit |
| Pearl | Precious jewel. A hard, rounded gem, usually white in colour | Female | Latin |
| Pebbles | after the character in 'The Flintstones' cartoons | Male | |
| Pedro | A Rock | Male | Spanish |
| Peg | pearl | Female | English |
| Peggy | pearl | Female | English |
| Pere | Rock | Unisex | Catalan |
| Perry | French form of Peter
| Male | English |
| Pete | A rock. Form of Peter.
| Male | English |
| Peter | A rock. Peter the biblical fisherman and apostle had impulsive nature and rocklike faith. In Catholic tradition he is the first pope.
| Male | Greek |
| Petey | | Male | |