Eren sits next to 4 phonetic neighbors — Aaron, Erin, and Aren are the closest matches by sound. Most share Eren's Turkish/Sufi tradition-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"saint, holy man, sage"
"he shall live"
"young bird, baby bustard"
"praiseworthy, highly commended"
"da + mir (to give + peace)"
"God is salvation"
"lion"
"may God give increase"
"the pure and selected"
"cosmic serpent (mythological)"
Similar sound: These names share phonetic patterns with Eren — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Turkish/Sufi tradition origins, giving them the same cultural heritage as Eren.
Rhythm: Eren is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.