Kassius sits next to 3 phonetic neighbors — Cassius, Cassian, and Casio are the closest matches by sound. Most share Kassius's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"hollow, empty"
"victors garland"
"strength of God, God is my light"
"castle, new home"
"from the angel clan"
"a type of ocean fish"
"narrow (from Kyle's Gaelic root caol)"
"peace, gentle"
"dark one, little dark one"
"variant of Pruitt, meaning valiant"
"armed host, military force"
"steps over a fence or wall"
"will and fame"
"one who serves"
"from the surname of poet W.H. Auden"
"little fire (from Irish aodh)"
"peace of the father"
"dear, beloved"
"brave as a lion"
"peaceful ruler"
"advice, counsel"
Similar sound: These names share phonetic patterns with Kassius — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Kassius.
Rhythm: Kassius is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.