Robinson sits next to 5 phonetic neighbors — Robson, Robertson, and Robison are the closest matches by sound. Most share Robinson's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Robin, son of Robert"
"God has been gracious"
"of Anthony, son of Anthony (via De- prefix)"
"possessor of good; wealthy king"
"warrior, earth ruler"
"estate on the River Aire"
"rye clearing, wood clearer"
"son of Eric, son of the ever-ruler"
"noise, tumult"
"peace (folk etymology)"
"one of free status"
"constructed blend name"
"grey valley or settlement"
"remembered by Yahweh"
"reborn, renewed"
"strong ruler"
"courageous, fearless"
"bright-headed"
"farm by the dragging place"
"talon, claw of a bird of prey"
"town of the lexicon"
Similar sound: These names share phonetic patterns with Robinson — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English origins, giving them the same cultural heritage as Robinson.
Rhythm: Robinson is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.