Larson sits next to 3 phonetic neighbors — Carson, Mason, and Lawson are the closest matches by sound. Most share Larson's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Lars (son of Lawrence)"
"of the birds, bird-like"
"handsome, cheerful"
"secluded valley"
"hero, brave warrior"
"chess castle piece"
"willow farm, ledge estate"
"lake of the sage Kashyapa (Sanskrit etymology)"
"possibly from dragon + valley"
"God supports"
"lover of horses"
"without death, eternal"
"brilliant, shining"
"son of Paye/Pace (son of Peace)"
"tumult, riot"
"God has helped"
"rocky hill settlement"
"from the place called Jersey"
"place of the torch or fire"
"praiseworthy"
"who is like God (form of Michael)"
Similar sound: These names share phonetic patterns with Larson — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scandinavian origins, giving them the same cultural heritage as Larson.
Rhythm: Larson is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.