The 'X' in X-Japan really means nothing, it was just the name of the previous band Yoshiki was in (the drummer, he's still really famous now). When he made a new band, he added on the 'Japan' because a lot of bands in the states had 'X' in the name, or when they heard of it they thought it was an english band.
As for j-rock bands..Dir en grey, Malice Mizer (they disbanded, but Mana made a new band called Moi dix Mois, you can check them out too), L'arc~en~Ciel, SID, Alice Nine, Psycho'le'Cemu, Gackt..those are about all I can think of at the moment.
Dir en grey is my current favorite j-rock band, but they're losing popularity in Japan because they are supposedly sounding too 'american'. Go figure. I think they sound excellent, and they're having a new single coming out on September 21 (called CLEVER SLEAZOID). For some song titles of Dir en grey, I recommend Jesus Christ R'nR, R to the Core, egnirys cimredopyh +) an injection, Myaku, JESSICA, DRAIN AWAY, Yokan, Ain't Afraid to Die, or 24ko Cylinders. I'd name wayyy more, but I don't want to take up too much space, lol.
By the way, it's Dir en grey, NOT Dir en Grey or Dir En Grey. That's one of the most common mistakes, and one of the most annoying. ^_^
Hope I could help~! ^___^
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