Crimson sits next to 3 phonetic neighbors — Crystal, Carmen, and Crispin 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 purplish-red color"
"gift from God (secondary folk etymology)"
"pure"
"meadow, woodland clearing"
"purity, cleanliness"
"the west wind god"
"shining light, day"
"sea, ocean (alternate etymology)"
"flowing from God"
"joyful, exuberant"
"land near the road"
"bird, sparrow"
"garden of holly"
"unique, without equal"
"successful, one who attains her goals"
"handsome, fair"
"rye clearing, meadow"
"modern blend of Shasta and -lyn suffix"
"she who lives"
"woodland clearing (Locc's meadow)"
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 qirmiz via Medieval Latin 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.