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"
"beloved, wished-for child"
"priests meadow"
"emerald, precious green stone"
"great, vast (Korean) + meadow/clearing (Old English Lee)"
"noble, nobility"
"Yahweh is great"
"devoted to a sacred purpose"
"from the elder tree farm"
"candle maker or seller"
"blessed with divine vision"
"noble, of noble kind"
"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.