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"
"evenness of mind, inner balance"
"invented name with graceful, flowing sound"
"God is gracious"
"devoted to divine praise"
"flour, ground grain"
"Victorious mind; one who has conquered the mind"
"Angel, fairy, heavenly being"
"original American creation (likely influenced by names meaning God ..."
"white wave"
"God is gracious"
"beam of light, torch"
"ascetic, one who renounces worldly pleasures"
"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.