Cassius sits next to 4 phonetic neighbors — Cassian, Caspian, and Casper are the closest matches by sound. Most share Cassius's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"hollow, empty"
"mind, spirit, heart"
"God has given"
"whole, universal, powerful"
"son of Armand, warrior"
"poet"
"warrior, man"
"ruler of the world"
"dark-complexioned"
"throne, master"
"merciful, gentle"
"man from South Munster"
"God strengthens, Yahweh is my strength"
"mind, intellect, spirit"
"woodland"
"father of height"
"son of Karr"
"from the rye field"
"healed by God"
"Brixis settlement"
Similar sound: These names share phonetic patterns with Cassius — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Cassius.
Rhythm: Cassius is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.