they don't use X, Y, Z, Q and i can't remember the 5th letter. There are lots of Y and Z names they could use (not so many X's, but enough for 6 lists)...
and i believe they retire names associated with killer storms (so they have to change the names on the repeating lists)
and yes i do think many of the names they come up with are stupid sounding...wilma for example...
having grown up in tornado alley, i prefer my storms unnamed.....we remember the killer ones regardless...
by the way, i remember well the fight to get men's names included in the list....i was in graduate school at the time.....it was one of the feminist fights of the 70's......a great feminist legacy - we can call a storm Dennis or Ivan..