So the funny thing is that I was watching a CK II Let's play and I noticed in the Let's Play that a Capetian had become Duke of Luxemburg and while I had recalled reading such before I wanted to be sure and thus I looked up the last several Grand Duke's of Luxembourg to make sure I was correct, and yes I was. While Luxembourg has like the British and the Dutch continued to use the same dynasty name regardless of the throne passing through females, and thus nominally House of Nassau-Weilburg, the Jean is an agnatic descendant of Hugh Capet as is his son Henri.
This all happened basically a day or two before he passed away.
I was waiting for a CK II comment to pop up in this thread. I just got back into the game and took a little spin trying to restore the old Persian Empire as a Zoroastrian. Abbasid aggression and the Seljuk event ended up ruining me but such is the joy of the chase.