Aillene sits next to 5 phonetic neighbors — Aileen, Eileen, and Irene are the closest matches by sound. Most share Aillene's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright shining one; light"
"God is gracious"
"little orca, little whale"
"gift of God"
"little rush, little reed (from the leaf shape)"
"heart, courageous heart"
"New beginning"
"from Corinth"
"steadfast, constant"
"lily (Sue/Susan) + grace (Ann/Anne)"
"noble and pure"
Similar sound: These names share phonetic patterns with Aillene — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Gaelic origins, giving them the same cultural heritage as Aillene.
Rhythm: Aillene is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.