Gordon sits next to 3 phonetic neighbors — Jordan, Cordon, and Gordie are the closest matches by sound. Most share Gordon's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"great fort, spacious hill"
"crow, raven"
"crooked nose"
"one who works a lathe, craftsman"
"yellow, golden"
"reed island, island near the clearing"
"sea"
"faith, pledge"
"stone worker (via Mason)"
"dweller by the holly"
"salmon"
"modern invented name"
"short form of Asher (happy, blessed)"
"oak grove, great"
"son of Jack"
"defender of men"
"primordial deity, elder god"
"gift"
"outer wall of a castle (bailey)"
"God will add, God will increase"
"wolf"
Similar sound: These names share phonetic patterns with Gordon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish Gaelic/Brittonic origins, giving them the same cultural heritage as Gordon.
Rhythm: Gordon is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.