This list includes 27 Latin boy names that start with O, from “Ocellus” to “Ovinius”. The entries include familiar saints and Roman family names as well as rarer classical forms. These names are useful for expectant parents, writers, and researchers exploring Latin-root choices.
Latin boy names that start with O are male given names from Latin-language roots beginning with the letter O. Many come from Roman family names, saints, or Latin words for numbers and traits, as in “Octavian”.
Below you’ll find the table with Name, Pronunciation, Meaning, Origin/Notes, and Usage/Popularity.
Name: This column lists each Latin name so you can scan familiar or rare options quickly.
Pronunciation: Gives a simple respelling or IPA guide so you can say the name correctly and compare pronunciations.
Meaning: Summarizes the name’s literal meaning in three to ten words to show its original sense and appeal.
Origin/Notes: Notes historical or cultural context, such as Roman family usage, saint associations, or classical references.
Usage/Popularity: Provides a brief sense of modern use so you can judge how common or unusual a name is today.
Latin boy names that start with O
| Name | Pronunciation | Meaning | Attestation |
|---|---|---|---|
| Octavius | ok-TAH-vee-us | From octavus, “eighth” (originally eighth-born) | Republican and Imperial inscriptions; gens Octavia prominent. |
| Octavianus | ok-TAH-vee-AH-nus | Belonging to Octavius, “of the Octavii” | Gaius Octavianus (Augustus); Imperial-era usage. |
| Octavus | OK-tah-vus | Latin “eighth” (ordinal) | Attested as cognomen and occasional praenomen in inscriptions. |
| Otho (Othō) | OH-tho | Likely Etruscan origin; meaning uncertain | Marcus Salvius Otho, Emperor (69 AD); historical sources. |
| Ovidius | oh-VIH-dee-us | Uncertain; possibly Oscan or gentilicial root | Publius Ovidius Naso (poet); widely attested in Latin literature. |
| Orestes | oh-REH-steez | Greek origin, “mountain dweller” or derived sense | Frequent in Latin literature (Virgil, Seneca) and mythological texts. |
| Orpheus | OR-fee-us | Greek; uncertain etymology, mythic name | Common in Roman poetry (Ovid, Virgil) and art references. |
| Onesimus | oh-NEH-si-mus | Greek “useful” (onesimos) | Attested in New Testament; appears in Latin Christian writings. |
| Onesiphorus | oh-neh-SIH-for-us | Greek “bringing profit” | Named in New Testament; appears in Latin ecclesiastical literature. |
| Opimius | oh-PEE-mee-us | From opimus, “rich” or “abundant” | Lucius Opimius (consul); Republican sources and inscriptions. |
| Opiter | OH-pih-ter | Ancient praenomen; etymology uncertain | Early Republican lists and inscriptions (archaic families). |
| Oppius | OP-pee-us | Gentilic name of uncertain root | Gens Oppia attested in Republican and Imperial inscriptions. |
| Opellius | oh-PEL-ee-us | Nomen of uncertain origin | Marcus Opellius Macrinus, emperor (217–218); inscriptions. |
| Otacilius | oh-tah-KEE-lee-us | Likely Oscan or Italic origin | Gens Otacilia attested in Republican and imperial inscriptions. |
| Orosius | oh-ROH-see-us | Probably from Greek oros “mountain” | Paulus Orosius, 5th-century historian; Late Antique sources. |
| Orbilius | or-BIH-lee-us | Diminutive of orbis, “little circle” | Orbilius Pupillus, grammarian; literary references (Horace). |
| Orfitus | or-FEE-tus | Uncertain, possibly Sabine origin | Attested among 2nd–4th century senators and inscriptions. |
| Orontius | o-RON-shee-us | Likely Eastern/Greek origin | Saint Orontius of Lecce; hagiographies and inscriptions. |
| Orentius | o-REN-tee-us | Possibly from Latin orior “to rise” | Appears in Christian martyr lists and inscriptions. |
| Orientius | or-en-TEE-us | From Latin oriens, “eastern” or “rising” | Orientius, 5th-century poet-bishop; church and literary attestations. |
| Olympius | oh-LIM-pee-us | From Greek Olympus, “mountain of the gods” | Attested for saints and bishops in Late Antiquity. |
| Olympianus | oh-lim-pee-AH-nus | Pertaining to Olympus | Olympianus appears in Late Antique inscriptions and bishop lists. |
| Origenes | oh-RIH-jeh-neez | Greek “born of origin” | Origen (Origenes), early Christian theologian; Latin Patristic texts. |
| Ocellus | oh-KEH-lus | Diminutive of oculus, “little eye” | Ocellus Lucanus, Pythagorean figure; mentioned in Latin philosophical texts. |
| Ostorius | os-TOR-ee-us | Possibly from ostium or other root | Publius Ostorius Scapula, governor of Britain; inscriptions. |
| Ovinius | oh-VIN-ee-us | Nomen, perhaps from ovis “sheep” | Gens Ovinius attested in inscriptions and municipal records. |
| Oppianus | oh-PEE-ah-nus | Derived from Oppius or Greek Oppianós | Oppianus (poet) referenced in Latin scholarly sources. |
Descriptions
Octavius
Nomen of the famous gens including Gaius Octavius (Augustus). Common Roman family name later used as a personal name.
Octavianus
Cognomen indicating membership of the Octavia family branch; famous as Augustus’ family name before his imperial title.
Octavus
Used to mark an eighth child or birth order; authentic Roman personal name though uncommon.
Otho (Othō)
Famously borne by Emperor Otho; probably Etruscan in origin but well attested in Latin historiography.
Ovidius
Name of the poet Ovid; a well-documented Roman nomen found in literary and epigraphic sources.
Orestes
Greek hero name widely used by Roman authors and later Latin traditions; literary and mythic associations.
Orpheus
Legendary musician from Greek myth; Latin poets frequently used the figure and name in literary contexts.
Onesimus
Originally a runaway slave in Paul’s letter; later adopted as a Christian personal name in Latin contexts.
Onesiphorus
Rare Christian name from Pauline letters; preserved in Latin church writings and martyrologies.
Opimius
Patrician nomen known from Republican Roman politics; associated with notable magistrates.
Opiter
Very rare archaic praenomen preserved in a few early Roman families like the Verginii.
Oppius
Plebeian nomen found in inscriptions and literary mentions; authentic Roman family name.
Opellius
Nomen borne by Emperor Macrinus; attested in imperial records and histories.
Otacilius
Nomen of a Roman gens with Italic roots; appears in epigraphy and legal records.
Orosius
Authorial cognomen known from Paulus Orosius’ histories; used in late Latin literary culture.
Orbilius
Well-known teacher of Horace; authentic Roman cognomen attested in literature and inscriptions.
Orfitus
Senatorial cognomen in Late Antiquity (e.g., Ceionius Orfitus); rare but historically attested.
Orontius
Name of an early Christian martyr-bishop, Latinized from regional forms; preserved in local cults.
Orentius
Found among early Christian martyrs and saints; used in Latin ecclesiastical sources.
Orientius
Late Antique poet and bishop; cognomen likely indicating eastern origin or orientation.
Olympius
Greek-origin name Latinized in ecclesiastical and epigraphic records; used by Christian clerics.
Olympianus
A Latinized adjectival form used as cognomen or episcopal name in late Roman and Byzantine contexts.
Origenes
Greek author widely known through Latin translations and citations; name used in Latin church literature.
Ocellus
Name of an early philosopher (or pseudepigraphic author) preserved in Latin philosophical tradition.
Ostorius
Gens Ostoria known from Republican and Imperial records; authentic Roman nomen.
Ovinius
Less common nomen appearing in epigraphy; genuine Roman family name.
Oppianus
Name used for the Greek poet Oppian in Latin references; appears in classical scholarship and manuscripts.