That’s doubtful. The Mandalorians had stayed on their home world in the outer rim for a long time while the title of Darth was created in the deep core.

Lucas chose Darth Vader due to it sounding a bit like Dark Father. So Darth means dark.

^Actually that was a happy coincidence. He went on the record of saying that it was actually to make the audience associate him with a Dark Invader.

@SagaSeeker Oh I thought it's about the in-universe context, but if it isn't, you're definetely right.

^^ In the Star Wars Behind the Magic CD ROM 1998 it says Lucas intended it to sound like Dark Father.

^The Father-thing doesn't really make much sense, though, does it? I'm not 100% sure about it but Lucas initially didn't plan for Vader to be Luke (and Leia)'s father, right? He had this idea only during the production of TESB, or at least, so I've heard. So, why would Lucas give the big bad guy of the first SW-movie a name referring to being a parent?

^yeah it's probably just coincidence.

Dunno but that's what it says in the CD ROM. Lucas does contradict himself at times though. It was probably an afterthought to make him look like he knew what he was doing all along.

^It could be that he was trying to promulgate the myth that he planned his 6 movie saga since the beginning. Which I frankly wouldn’t blame him for.

Yep. Retconning his own artistic process.