Octavius \o-cta-vius, oc-tavius\ as a boy's name is a variant of Octavio (Latin), and the meaning of Octavius is "eighth". See also Dontavius and Sextus.

The baby name Octavius sounds like Octavus and Octavious. Other similar baby names are Octavian, Octavo, Octovien and Octave.