Crystal is from the Greek krystallos ("ice, rock crystal"). Used as an English given name from the late 19th century; the name explosion came with the launch of the prime-time soap opera Dynasty (1981-1989), starring Linda Evans as Krystle Carrington — peak character at the moment American culture embraced "jewel" names. A top-25 US baby name from 1980 to 1996, peaking at #9 in 1982. Crystal Gayle (born 1951) — American country singer; Don't It Make My Brown Eyes Blue (1977). Crystal Bird Fauset (1894-1965) — first Black woman elected to a US state legislature (Pennsylvania, 1938).
Featured throughout 1980s American culture; subject of the Dynasty franchise.
In Pythagorean numerology the letters of Crystal reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.