Cie sits next to 4 phonetic neighbors — Sia, Cee, and Sky are the closest matches by sound. Most share Cie's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"brightness, radiance"
"lover of Gods glory"
"God is gracious (via Jennifer)"
"equality, equanimity"
"beam of light, torch"
"Victorious mind; one who has conquered the mind"
"flour, ground grain"
"original American creation (likely influenced by names meaning God ..."
"ascetic, one who renounces worldly pleasures"
"invented name with graceful, flowing sound"
"Angel, fairy, heavenly being"
"God is gracious"
"God is gracious"
"honey bee"
Similar sound: These names share phonetic patterns with Cie — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish origins, giving them the same cultural heritage as Cie.
Rhythm: Cie is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.