Olson sits next to 4 phonetic neighbors — Olsen, Nelson, and Wilson are the closest matches by sound. Most share Olson's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"ancestors relic, heir"
"ruler of the people"
"homeland person"
"gate keeper"
"the white one, fair"
"eternal ruler (variant of Erik)"
"to flow down; to descend"
"people's king"
"descendant of the champion"
"well-digger"
"bone"
"surname used as given name"
"paw, claw"
"of Mark, belonging to Mars"
"bearer of Christ"
"my gift"
"strong wolf, wolf valor"
"God has given, gift of God"
"my God"
"cross; the Holy Cross"
"town in the forest (alternate etymology)"
Similar sound: These names share phonetic patterns with Olson — 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 Olson.
Rhythm: Olson is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.