I originally figured that Rupuran was Leblanc's name in the Japanese version or something. Yes, it calls Rupuran "sir," a masculine title, but considering that Japan has a bunch of female characters going by "lord" (Lord Ran in Twinkle Star Sprites, for example), it's not unusual. Leblanc's name in the Japanese version is just Leblanc, though, so I don't know.

In any case, it's not half as nonsensical as the vast majority of titles on the Final Fantasy Tactics soundtrack.