Orson sits next to 3 phonetic neighbors — Carson, Arson, and Horton are the closest matches by sound. Most share Orson's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"little bear, bear cub"
"summit, top"
"wealthy protector"
"serpent's mouth"
"pledge of peace, divine peace"
"from the Welsh Seisyll"
"to conquer, to win"
"eagle"
"mountain"
"from Clare (Suffolk)"
"he to whom it belongs, messianic title"
"lord (if related to Kyrie)"
"slender, narrow"
"from Chester (place name)"
"jewel, gem"
"modern invented name"
"brave lion, lion-hearted"
"flowing down (from Jordan)"
"salvation of the Lord (via Isaiah element)"
"fair, white (from Finn)"
Similar sound: These names share phonetic patterns with Orson — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old French origins, giving them the same cultural heritage as Orson.
Rhythm: Orson is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.