Eun sits next to 3 phonetic neighbors — Un, Eon, and Yoon are the closest matches by sound. Most share Eun's Korean-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"silver"
"free one, from France"
"a plain, fertile land"
"follower of Christ, Christian woman"
"harvester, reaper"
"uncertain — possibly indigenous Mexican origin"
"God is gracious"
"of the earth, earthling"
"God is gracious"
"Lily; rose; from Hebrew Shoshana"
"joy; gladness"
"Charming; playful"
"beloved, dear one"
Similar sound: These names share phonetic patterns with Eun — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Korean origins, giving them the same cultural heritage as Eun.
Rhythm: Eun is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.