Crimson sits next to 3 phonetic neighbors — Crimmons, Grayson, and Brinson are the closest matches by sound. Most share Crimson's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"deep blood-red color"
"golden, made of gold"
"son of the gray-haired one"
"little Hugh"
"shining, bright (via Hebrew Meir)"
"father, head of monastery"
"little drop of water"
"royal town or manor"
"modern invented name, possibly eight (from Octavian)"
"of Mars, warlike"
"great homestead, large settlement"
"son of the right hand"
"slender, narrow"
"brave in war"
"earth (via Gaia connection)"
"belonging to the Lord"
"fort, castle"
"modern American invented variant of Zayd"
"God will hear"
"variant of Jason"
Similar sound: These names share phonetic patterns with Crimson — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Arabic via English origins, giving them the same cultural heritage as Crimson.
Rhythm: Crimson is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.