Ottavius as a Baby Name. Meaning and Origin of Ottavius

What is the meaning of the name Ottavius ?

The baby name Ottavius is a Male name , 4 syllables long and is pronounced oh-TAY-vee-us (IPA: /ɒˈteɪviəs/).

Ottavius is Latin in Origin.

Ottavius is a learned, Neo-Latin variant of Latin Octavius, ultimately from Latin octavus "eighth." In Italian, the same root produced Ottavio and the ordinal ottavo; humanists often re-Latinized Ottavio as Ottavius in scholarship and church records. The name carries the sense of "the eighth (born/child)," a reference used in Roman naming and later Christian Europe, and it also links etymologically to October, once the eighth month of the Roman calendar.

Usage traces to the Roman gens Octavia, from which Gaius Octavius (later Augustus) emerged, giving the name a classical imperial aura. In English-speaking countries, Octavius saw 18th to 19th century use, especially for an eighth son; Ottavius remains the rarer, antiquarian spelling. Related forms include Octavius, Octavian, Octavio (Spanish), Otávio (Portuguese), Ottavio (Italian), Octave and Octavien (French), and feminine counterparts Octavia and Ottavia. Nicknames such as Tavi or Tavo are sometimes adopted in modern use.

⚙ Ottavius turns up in none of the birth registries or name datasets we cover. Most often that means a rare name, a regional or heritage one, or a recent coinage. Either way, it remains a genuinely rare choice.