Coulson sits next to 5 phonetic neighbors — Colson, Dawson, and Carson are the closest matches by sound. Most share Coulson's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Cole (son of Nicholas)"
"modern blend of Waylon and Lynn"
"joyful"
"high prominence, brow"
"pledge, oath"
"of the faith, religion"
"gentle birth, beloved"
"twin (loose association)"
"name of God"
"little king, kingly"
"Peace and relief from sorrow"
"one who hunts with birds (falconer)"
"bright, splendid"
"modern invented name"
"A dark image or form following a person or object"
"wood-dweller"
"victory of the people (via Nicholas)"
"Western cowboy hat, frontier spirit"
"enclosed woodland"
"rocky land, land of rock"
Similar sound: These names share phonetic patterns with Coulson — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English patronymic origins, giving them the same cultural heritage as Coulson.
Rhythm: Coulson is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.