Back in 1991, if you wanted to know the full names of the guys in the Goo Goo Dolls, you had to ask — because the credits on their records wouldn’t tell you.On “Hold Me Up,” the band’s third album, the liner notes stated simply, “The Goo Goo Dolls Are: George, Drums, Vocal; Johnny, Guitar, Vocals; Robby, Bass Vocals.” So when I got Johnny on the phone in May 1991 for an American-Statesman preview of the band’s show at Cannibal Club, a then-thriving Sixth Street alt-rock hub, I asked what the deal was.“Our last names are just really long, not very rock ‘n’ roll,” he said, but he confessed that