| Name | Language | Saint | Meaning | Origin of the name | Celebration |
|---|---|---|---|---|---|
| Olga | Español | Saint Olga of Kiev | 11 of July | ||
| Olguita | Español | Saint Olga of Kiev | 11 of July | ||
| Oliva | Español | Saint Oliva of Anagni | 3 of June | ||
| Olivia | Español | Saint Olivia mártir | 3 of February | ||
| Oportuna | Español | Saint Oportuna | 22 of April | ||
| Otilia | Español | Saint Otilia | 13 of December |