My personal favorites are:
EXO - cool, beautiful, simple, gave origin to the coolest logos, nice to spell in songs, elegant, nice sound
2ne1 - sounds cool enough on its own but the meaning is also really cool: to anyone
Biased favorite:
IVE - cute meaning, sounds feminine and elegant, simple, reminds me of the wgord ivy which is also pretty
Others I like:
Red Velvet, Hello Venus, AoA (Ace of Angels), Blackpink, Loona