Aelin sits next to 5 phonetic neighbors — Aylin, Aileen, and Eileen are the closest matches by sound. Most share Aelin's Celtic-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright, shining"
"water"
"Woman, feminine"
"one who plays music"
"free spirit (modern connotation)"
"infinite time, endless existence"
"earth, land, soil"
"lucky, blessed with increase"
"fruitfulness, uprightness"
"musical consonance"
"friendly, amiable, good companion"
"pleasant"
"one who weans or abstains"
"soft breeze, gentle wind"
"noble strength"
"made of linden wood, gentle and protective"
"Soft-haired, youth"
"mighty, great, powerful"
"first ray of sun"
"snow"
"city"
Similar sound: These names share phonetic patterns with Aelin — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Celtic origins, giving them the same cultural heritage as Aelin.
Rhythm: Aelin is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.