Yes, I've been thinking about that too. I know Transformers were affiliated with Marvel in the early days, but if having a comic character called Bombshell is a problem now, surely it would have been a problem back when the Insecticons first came out in the 80's?
http://en.wikipedia.org/wiki/Bombshell_(Marvel_Comics)
(Although I guess maybe Marvel's human Bombshell wasn't worth trademarking, while DC feels that theirs is.)