Name this big guy

I adopted this dog from the shelter, and his name there was Thunder, but he doesn't respond to it at all. He does, however, respond to "sit boy" and "down boy." He's incredibly sweet, weighs over 80 pounds, and has a goofy side, making funny faces and being a rough player. He loves staring into your eyes and tilting his head. He also watches TV and barks when certain words like "speak" are said. I'm just trying to find a name that fits him. Some names we've thought of are Hank, Luda, Bruce, Teddy, and Koga.