These names make no sense? Kanto has clear city-color-type relation and Johto is just wtf?

Violet = violet = Morty?
Azalea = pink flower = Whitney?
Cianwood = lightblue = Falkner?
Olivine = olive = Bugsy?
Ecruteak = ecru = Pryce?
Mahogany = redbrown = Chuck?

maybe:
Goldenrod = golden = Clair
Blackthorn = black = Jasmine