I’ve come across a few posts from folks who claim that K. W. Jeter’s The Bounty Hunter Wars trilogy references the Clone Wars. Specifically, that the majority of Mandalorians disappeared from the known galaxy at the end of the wars, their fleet making a blind hyperspace jump into the unknown. None of them cited their sources, though, which is frustrating.
That’s the coolest idea ever. So naturally, it didn’t happen in any canonical material.