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"
"rock, mass"
"knowledge, good judgment, deep understanding"
"the Lord is my God"
"son of Rhys, ardor and enthusiasm"
"modern invented name, lively"
"clever, skilled"
"gift of God (from Armenian/Hebrew Zaven)"
"son of Jan (John)"
"companion, friend"
"God is expectant, awaiting God"
"gray-haired one from the valley"
"one who bakes"
"flower sound"
"son of Thomas, son of the twin"
"descendant of the fair one"
"connected to healing arts"
"modern invented name, variant of Cole/Colson"
"land of Eoghan (Owen)"
"one who ropes (cowboy)"
"forest dweller’s son"
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.