Kopen sits next to 4 phonetic neighbors — Kobe, Cohen, and Copen are the closest matches by sound. Most share Kopen's Dutch-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"to buy, to trade, merchant"
"one who illuminates"
"modern invented name, possibly sun"
"raspberry (fruit)"
"pure, bright, shining"
"sensitive perceiver, artist of words"
"modern invented name combining elements of strength and wisdom"
"Settlement near a rift or cleft in the land; from Old English rif (..."
"a magical charm or spell; also a curse"
"royal advisor, kingly counselor"
"little ruler"
"lone champion"
"prince"
"immortal, deathless"
"mercy of God"
"from the barley meadow (topographic)"
"blessed one"
Similar sound: These names share phonetic patterns with Kopen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Dutch/Germanic origins, giving them the same cultural heritage as Kopen.
Rhythm: Kopen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.