Eilonwy sits next to 3 phonetic neighbors — Eleni, Elonwy, and Elwyn are the closest matches by sound. Most share Eilonwy's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"radiant, bright"
"initiated, consecrated"
"from the elder tree farm"
"blessed with divine vision"
"priests meadow"
"of noble birth"
"great, vast (Korean) + meadow/clearing (Old English Lee)"
"emerald, precious green stone"
"God is exalted"
"candle maker or seller"
"noble, of noble kind"
"beloved, wished-for child"
"awakening, little rock"
Similar sound: These names share phonetic patterns with Eilonwy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Eilonwy.
Rhythm: Eilonwy is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.