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"
"pure (short for Catherine)"
"God has remembered"
"grey hill, army hill"
"victory of the people"
"brave, bold"
"one who has made pilgrimage to the Holy Land"
"dweller by the holly"
"earth"
"earthly, of the earth"
"God is gracious"
"heel, sharp point"
"God has been gracious"
"powerful spearman"
"little ancient one"
"Moorish, dark-skinned"
"gift, wealthy possessor"
"Gomeric's mountain, power mountain"
"god-helmet"
"descendant of Otto"
"victory of the people"
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.