Carlson sits next to 4 phonetic neighbors — Carson, Carlton, and Carlos are the closest matches by sound. Most share Carlson's Scandinavian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Carl, free man"
"one who gives light"
"strength of God"
"noble lord (compound creation)"
"immortal, eternal"
"bright town"
"possibly inspired by Zion, meaning monument or raised up"
"forever, always + wind/fighter (Ey + vindr etymology)"
"thorny shrub, wild rose"
"Pæga's farm"
"very blue, sapphire"
"valley of Wendel"
"distinguished one"
"responsive song, call-and-response music"
"of the heights"
"Settlement near the well"
"serious, earnest"
"variant of Elias: my God is Yahweh"
"brilliantly noble"
"modern coinage, gentle sound"
Similar sound: These names share phonetic patterns with Carlson — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scandinavian origins, giving them the same cultural heritage as Carlson.
Rhythm: Carlson is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.