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 sea (via Marius)"
"universe, cosmos"
"son of Cole; victorious people"
"vigorous youth"
"hillside, river bank"
"strong, hardy"
"honoring God"
"glowing, scorching"
"man of vigor, strong man"
"young warrior"
"God is my light, my flame is Yahweh"
"oak tree ford"
"sun, shepherd"
"invented American name, possibly river (from Zaire)"
"God is gracious (via Shawn/Sean/John)"
"curly-haired"
"darling, treasured one"
"Aromatic herb, salvia"
"place by a waterway lock"
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.