Greyson sits next to 3 phonetic neighbors — Grayson, Mason, and Jason are the closest matches by sound. Most share Greyson's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of the grey-haired one"
"variant of Jason"
"servant of Jesus"
"one who resembles God"
"consecrated to Mars"
"deer lover, champion warrior"
"victory of the people (short for Nicholas)"
"flowing body of water"
"beauty, grace, excellence"
"name of God"
"elm grove"
"from the castle, place near the ditch"
"bald, hairless"
"lion-bold; brave as a lion"
"man from Lucania"
"From Hebrew 'Gavriel'; the archangel Gabriel appears in the Bible, ..."
"from the valley of water"
"God will raise up"
"enduring, lasting"
"Lord"
"home ruler"
Similar sound: These names share phonetic patterns with Greyson — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English origins, giving them the same cultural heritage as Greyson.
Rhythm: Greyson is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.