I always liked that name

Ian Anderson, leader of the band Jethro Tull, speaks of his regrets over the band's name (in Billboard):

Anderson adds that recording and touring under his own name now also allows him to shed some guilt he's felt since February of 1968, when the group's booking agency gave Jethro Tull the name of an 18th century British agriculturist after several other monikers were rejected.

"If you'd asked me 20 years ago did I regret anything about my musical career, my answer then, as it is today, has always been the name of the band," Anderson admits. "I can't help but feel more and more as I get older that I'm guilty of identity theft and I ought to go to prison for it, really. It's almost as if I watched old Jethro Tull at the cash machine and leaned over his shoulder as he put his credit card into the machine to check out his PIN and filched his credit card form from his back pocket as he walked away and then fleeced his bank account. It doesn't make me feel very good. I never paid much attention in history class, so I didn't realize we'd been named after a dead guy until a couple of weeks later."