TPM
That Darth is a title, not a name. I mean, why the hell not? First of all, it’s a solid portmanteau (“Dark Lord of the Sith”). Second of all, maybe this is just me, but I think Darth is kind of a funny name, but works fine as a title. Also, despite what people say, there is nothing in the OT that would suggest this shouldn’t be the case.
Perhaps people would be more forgiving of “Darth” if it hadn’t come attached to atrocious names like “Plagueis” “Tyranus”, etc.