Kashius sits next to 5 phonetic neighbors — Cassius, Cassian, and Darius are the closest matches by sound. Most share Kashius's Latin-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the Cassius Roman family clan"
"prince, commander, leader"
"sacred songs, hymns of praise"
"lord have mercy (liturgical phrase)"
"hawk, noble"
"bird-like, of the birds"
"royal, kingly"
"noble, distinguished"
"son of Grace, gracious one"
"battle worthy, eager in battle"
"queen, counsel"
"modern phonetic variant of Jay-ko"
"modern coinage; possibly day-bright valley dweller"
"a group of birds, especially quail"
"defender of men"
"modern phonetic variant of Jacob"
"edge, border of land"
"from Kelso (place name)"
"knight, mounted warrior"
"Tyrian — of imperial purple"
"supplanter"
Similar sound: These names share phonetic patterns with Kashius — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Kashius.
Rhythm: Kashius is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.