WWE have been refused registration to trademark "Ryback". They were first refused back in January because the USPTO felt it was merely a surname and they don't allow trademarks for such. WWE got back to them a few days ago, giving various reasons as to why their Ryback is more than just a surname. They were again refused, this time final, because the USPTO were not satisfied with their answer.
An LLC based in New York named 'Mocker' registered to trademark "ECW" for wrestling use back in March. WWE apparently let the trademark slip.