Interesting. I figured Minos wasn't a Greek name, but this made me look it up to see what it meant. I guess the name means "king", if so that is possibly what Sarpedon means as well. I always thought Belleraphontes and Rhadamanthus were Greek words that could be parsed, but I just didn't have the skill level to do it but I guess Rhadamanthus is an unknown pre Greek word...
Ῥαδάμανθυς (blossoming flower) has indeed partly obsure etymology, it's the masculine of the feminine name Ῥαδαμάνθη = ῥάδαμνος (branch, twig, shoot) a possibly pre-Greek word + ἄνθος (flower), cognate with the Armenian word for field, and
, or the Sanskrit andhas
, sprout of the soma plant (definitely of IE substrate).
...and there is some speculation that Belleraphontes may have Luwian origins in the name and not Greek (Glaukos and Chimera are Greek words).
Well there's also the Hellenosemitic substrate hypothesis, that it's a Hellenosemitic word with first component the name of the god Bel (short of Baal), but rest assured it too is Greek, Βελλεροφόντης is the slayer of Bellerus, the tyrant of Corinth = Βέλλερος (Bellerus, the name of the Corinthian tyrant) + second element -φόντης (killer, slayer) from φόνος (manslaughter, murder)