Grayson sits next to 3 phonetic neighbors — Mason, Jason, and Greyson are the closest matches by sound. Most share Grayson's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"From the English surname 'son of the grieve (estate overseer)' or 'son of Gray'; a surname used as a modern first name"
"rowan tree (red-berried tree)"
"broad valley, broad hillside"
"gracious, mild"
"From the Scottish place name Logan; a topographic name from Gaelic ..."
"gift of God"
"man, human being"
"occupational name for an archer or bowman"
"lion"
"gravelly homestead"
"great wave"
"may God strengthen"
"from the surname Cauvin"
"blazing iron"
"lake colony, settlement by the pool"
"venerable"
"son of Jack"
"crooked river, winding stream"
"salvation of God, the Lord saves"
"the new house"
Similar sound: These names share phonetic patterns with Grayson — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English origins, giving them the same cultural heritage as Grayson.
Rhythm: Grayson is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.