Aelyn sits next to 5 phonetic neighbors — Aileen, Eileen, and Aylin are the closest matches by sound. Most share Aelyn's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright, radiant"
"white ring, blessed ring"
"diminutive of Eileen"
"blooming flower"
"one who knows, connoisseur"
"town, settlement"
"new, new star"
"who is like God (via Mikhail)"
"noble protector"
"God is my strength"
"wealthy, rich"
"cool waters (from Maasai Enkare Nairobi)"
"long journey, epic voyage"
"lovable, dear"
"abundance, growth"
"diminutive of James, meaning may God protect"
"split, torn asunder"
"gift, abundance; place of peace"
"heavenly, sky (from lani)"
"pearl"
"valley waterfall"
Similar sound: These names share phonetic patterns with Aelyn — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish/Celtic origins, giving them the same cultural heritage as Aelyn.
Rhythm: Aelyn is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.