Olen sits next to 4 phonetic neighbors — Olin, Owen, and Odin are the closest matches by sound. Most share Olen's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"ancestor's descendant"
"son of Cadan, fighter"
"luxurious softness"
"God is expectant, awaiting God"
"from the mountains"
"gift of God, gift of Yahweh"
"settlement near a tree stump"
"money, currency"
"strong power"
"one who deals in coal"
"crowned one"
"skilled craftsman with cutting tools"
"from the deep valley, Devon land"
"brave and hardy"
"ancient, enduring"
"crooked, winding"
"adult male deer, stag"
"steep rock face by a crossing"
"hollow, seething pool"
"little slender one"
Similar sound: These names share phonetic patterns with Olen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse origins, giving them the same cultural heritage as Olen.
Rhythm: Olen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.