I'm sure you could tank a product with an offensive name or something that required weird unicode characters. But I think it's only worth getting a passing grade on the name and then going for an A+ on the product.
I guess the argument is that if you're right on the margin a better name could tip you into winning. But I'd already consider a product a failure if it only gets to that middle ground on its own. If the name makes a difference I'd say you're not working on the right sort of problem.