Brilliance sits next to 3 phonetic neighbors — Brilliant, Bria, and Brielle are the closest matches by sound. Most share Brilliance's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"great brightness, exceptional intelligence"
"star maiden, goddess of justice"
"life"
"dear one, beloved friend"
"hare's land"
"beautiful devotion"
"father of many (inspired by Abraham) + blessed (Welsh wyn)"
"bird-like, like a bird in flight"
"up to the threshold"
"mythical bird of rebirth and immortality"
Similar sound: These names share phonetic patterns with Brilliance — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English origins, giving them the same cultural heritage as Brilliance.
Rhythm: Brilliance is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.