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"
"eagle friend"
"from Galloway"
"strength, powerful one"
"son of the reeve, estate manager"
"of the forest, wooded"
"land, territory"
"slender, gentle, delicate"
"battle, fighter"
"champion, expert"
"narrow land, island"
"famous warrior"
"club, mace (Germanic surname root)"
"tempest, violent storm"
"powerful, energetic"
"strong boar"
"modern invented name, unique spirit"
"God is my strength"
"ancient, enduring"
"modern invented name with noble, airy connotations"
"little dark one"
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.