Cass sits next to 4 phonetic neighbors — Cash, Cas, and Cassidy are the closest matches by sound. Most share Cass's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"hollow, vain (from Latin Cassius)"
"nobleman, patrician (via Patrick)"
"serious, sincere, determined"
"maker, builder"
"zero, the concept of nothing"
"God will establish (variant of Jacob)"
"my God is strength"
"meadow, pasture (possible alternate)"
"food, sustenance"
"modern coined name, possibly hillside light"
"son of Hermund"
"beloved of God"
"Ella's town or estate"
"son of grace, son of good fortune"
"thankful warrior"
"from the field, outdoors warrior"
"beloved"
"to be worthy"
"the lord (divine title)"
"of the sea, the pool"
"from the willow farm"
Similar sound: These names share phonetic patterns with Cass — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Cass.
Rhythm: Cass is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.