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"
"red-haired, ruddy complexion"
"modern coinage, gentle sound"
"noble valor, kingly"
"cloud"
"one who fulfills, generous"
"modern American invention with Latin roots"
"royal and bold"
"of Julius, born in July"
"spear ruler, spear power"
"firebrand, spark"
"modern invented name"
"forever, always + wind/fighter (Ey + vindr etymology)"
"God is gracious (from Sean element)"
"variant of Waylon, legendary smith"
"character name meaning transformation and power"
"descendant of Donndubhan"
"keeper of the keys"
"good, virtuous"
"precious, anointed"
"he who descended, to descend"
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.