| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 881 | Nuncio | Latin | Messenger. | M | |
| 882 | Nunzio | Latin | Messenger. | M | |
| 883 | Octavian | Latin | Variant of Octavius: Born eighth. Octavian was the name used commonly for the Emperor Augustus. | M | |
| 884 | Octavio | Latin | Eighth. | M | |
| 885 | Octavius | Latin | Born eighth. Octavius was a Roman clan name, as well as the original name of Emperor Augustus (commonly known as Octavian). Traditionally, this name was given to the eighth child in a large family. | M | |
| 886 | Oetavian | Latin | Born eighth. | M | |
| 887 | Oistin | Latin | Revered. | M | |
| 888 | Oliver | Latin | Olive (symbol of peace); peaceful. | M | |
| 889 | Oliverio | Latin | Peaceful. | M | |
| 890 | Oliverios | Latin | Peaceful. | M | |
| 891 | Olivier | Latin | Variant of Oliver: Olive (symbol of peace); peaceful. | M | |
| 892 | Ollie | Latin | Diminutive of Oliver: Olive (symbol of peace); peaceful. | M | |
| 893 | Olliver | Latin | Peaceful. | M | |
| 894 | Olvan | Latin | Peaceful. | M | |
| 895 | Orban | Latin | Born in the city. | M | |
| 896 | Orcus | Latin | The mythical underworld. | M | |
| 897 | Orson | Latin | Little bear. Actor and director Orson Welles. | M | |
| 898 | Ottavio | Latin | Born eighth. | M | |
| 899 | Ovid | Latin | Name of a poet. | M | |
| 900 | Paaveli | Latin | Small. | M | |