Grey sits next to 3 phonetic neighbors — Gray, Grace, and Greer are the closest matches by sound. Most share Grey's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"grey color"
"thorny shrub, wild rose plant"
"noble meadow"
"that which surrounds"
"follower of Christ"
"leather worker, one who tans hides"
"strong, free person"
"noble type (via Heidi)"
"pure, maiden"
"supplanter, one who follows at the heel"
"great sea, son of the sea"
"oak grove, oak meadow"
"new, fresh, young"
"sea-bright"
"home power, estate leader"
"flowing water"
"small bunch of flowers"
"pearl"
"bright, radiant (via Irish Niamh)"
"queen"
"sword"
Similar sound: These names share phonetic patterns with Grey — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Grey.
Rhythm: Grey is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.