Legends Sith Lords also make the most of the “cool evil name” trend: Sadow, Darth Ruin, Tenebrous, Nihilus, Phobos, Vengean, Desolous, etc.
As for silly names I’d also nominee Mercurial Swift (though granted, that was a pseudonym), General Loathsome from the Clone Wars pilot movie, and all those Abednedo extras in the sequels named after Beastie Boys songs: Ello Asty, Brasmon Kee, Slowen Lo, etc.