I think mononyms are an easily overlooked part of SW. Yoda (and Yaddle), Dooku, Palpatine (kinda, because Sheev never appears in the movies, although it's his official first name), Maul, Talzin, Sidious, Vader, Tyranus and all the Sith names in general, and the Clones' names. I feel like they greatly contribute to the mythological atmosphere. Nothing says 'this is a character filling in a specific role' to a western audience like an mononym or a title in lieu of a two-part name. We tend to very deeply associate two-part names with personhood, since they're what we need to exist as individuals within our own society, so anything else is gives off an impression of fictionality to us.
It also bears pointing out that many of these mononym-having character have a title in lieu of the expected first name: Master Yoda, Count Dooku, Mother Talzin, Chancellor Palpatine, Captain Rex and Commander Cody and the other Captains and Commanders, all the Darth Sith Lords, etc. Which, imo, only further stresses how they are roles within a story before anything else, which again makes the story so much more like a greek play or a fairy tale. They're earmaked as servants of the narrative by the storytelling conventions of the western canon, rather than being protagonists within it.
