Kassie sits next to 4 phonetic neighbors — Cassie, Kassi, and Kacey are the closest matches by sound. Most share Kassie's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"pure"
"angel, messenger of God"
"belonging to the night"
"bright, shining one"
"she who looks out"
"helper, cushion"
"golden one, gilded"
"beautiful, of light"
"beautiful praise (via Greek + Hebrew roots)"
"the poppy flower"
"beloved, wished-for child"
"treasurer"
"charcoal settlement"
"pure, maiden"
"leather worker, one who tans hides"
"young woman"
"strong one"
"made of gold, golden-colored"
"lily flower, purity"
"blooming, flourishing"
"full of grace"
Similar sound: These names share phonetic patterns with Kassie — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Kassie.
Rhythm: Kassie is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.