Elin sits next to 4 phonetic neighbors — Ellen, Elena, and Elaine are the closest matches by sound. Most share Elin's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright, shining light"
"clear, bright"
"idol, image"
"purpose, intention"
"song of joy, joyful song"
"woman from Magdala"
"one, unity"
"wren, small bird"
"light"
"snow"
"sacred garden, monastery"
Similar sound: These names share phonetic patterns with Elin — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek Helene origins, giving them the same cultural heritage as Elin.
Rhythm: Elin is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.