Eylin sits next to 7 phonetic neighbors — Aylin, Aileen, and Eileen are the closest matches by sound. Most share Eylin's Turkish, from ay (moon)-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"moon halo, soft glow of moonlight"
"protector"
"place by the sea (possible Kumeyaay origin)"
"dark, black-haired"
"big happiness, great light"
"heavenly (folk reinterpretation)"
"God is my song"
"beautiful, lovely"
"at a crossing, toll collector"
"inquiry, knowledge (from Greek historia)"
"goddess Savitri, divine solar figure"
"pearl"
"the pool or lake"
"artisan of language"
"champion, winner"
"slender, narrow"
"excessive pride in appearance"
"ruler through strength"
"wise protector"
"Day's eye; the daisy flower that opens at dawn"
Similar sound: These names share phonetic patterns with Eylin — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Turkish, from ay (moon) origins, giving them the same cultural heritage as Eylin.
Rhythm: Eylin is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.