Olsen sits next to 4 phonetic neighbors — Nelson, Olson, and Elson are the closest matches by sound. Most share Olsen's Old Norse-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Ole (ancestor)"
"born on Sunday"
"God is gracious"
"salmon, descendant of the salmon"
"precious green stone"
"crowned one, garland-wearer"
"God has helped"
"yew tree army"
"help, strength"
"modern invented name with sun/strength connotations"
"spirit, companion"
"sea, ocean"
"slender, gentle, delicate"
"wealthy protector"
"a crow-like black bird"
"settlement on the ridge, keel town"
"pointed hill, peaked summit"
"old friend"
"most high, exalted one"
"Yahweh has shown favor"
"graceful, elegant"
Similar sound: These names share phonetic patterns with Olsen — 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 Olsen.
Rhythm: Olsen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.