Octavia sits next to 4 phonetic neighbors — Olivia, Ottavia, and Tavia are the closest matches by sound. Most share Octavia's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"eighth"
"wise, knowing"
"powerful laborer, work ruler"
"beautiful"
"grace and lake"
"pilgrim, palm-bearer"
"noble one (folk etymology)"
"fleet of ships"
"marvel, object of wonder"
"a day's travel, voyage"
"From Denmark"
"resurrection"
"yielding to prayer, easily entreated"
"oak tree, pool"
"lioness of God"
"youthful, downy-haired"
"noble, nobility"
"musical concord, agreement"
"of the elm grove"
"meadow covered in heather"
Similar sound: These names share phonetic patterns with Octavia — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Octavia.
Rhythm: Octavia is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.