Octavius sits next to 4 phonetic neighbors — Octavio, Tavius, and Ottavio are the closest matches by sound. Most share Octavius's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"eighth-born"
"variant of Cameron"
"old settlement"
"sea fortress"
"supplanter, one who follows at the heel"
"little man, warrior"
"father of peace"
"pointed mountain, hill"
"of the forest, wooded"
"melody, song (mythological)"
"Yahweh is merciful"
"of Mars, warrior"
"strong boar"
"rhythm, flow, cadence"
"cowherd's descendant"
"lover of hounds"
"from Rome (Rum/Anatolia)"
"held by the heel"
"rejoice, delight"
"river in Peru"
Similar sound: These names share phonetic patterns with Octavius — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Octavius.
Rhythm: Octavius is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.