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"
"flowing water, river"
"my strength is Yahweh"
"honor-friend"
"supplanter, one who follows at the heel"
"bald, little bald one"
"God is gracious"
"passionate, ardent"
"one who lives near a steep bank"
"black, dark-haired"
"divine strength"
"son of Elijah"
"advice, counsel"
"son of Carr, son of the marsh dweller"
"kingly, held by the heel (supplanter)"
"muddy farm or settlement"
"variant of Drew, meaning manly/strong"
"hilltop estate"
"God is gracious and humble"
"rapid water"
"my rock is God"
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.