Stone Cold Steve Austin
When you think of major stars in the WWE over the course of the past generation or so, there are few bigger figures or names than Stone Cold Steve Austin. The Texas Rattlesnake was the hero of the Attitude Era, and the ultimate anti-authority figure. The name 'Austin' may well, therefore, be synonymous with this legend, but it isn't his actual name. He was born Steve Anderson, a name later changed to Steve Williams, according to the Superstar's book.
William Regal
William Regal's placing in this list may appear random, but there's a method to it. You see, he wrestled for much of his career in WCW and WWE as Steven Regal but, with so many many wrestlers named Steve around (Austin, Williams, Blackman, etc), WWE opted to switch the Brit's name to William. All of that is also moot when it comes to Regal's real name, as he's neither a Steve nor a William, he's one Darren Matthews.
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Becky Lynch
The Man, the leader of the women's roster on RAW and the brand's Women's Champion, Becky Lynch is undisputed as one of the hottest acts in WWE right now. Fiery and determined she maybe, but a Lynch she is not - at least in 'real' life - Rebecca's (Becky's) real surname is Quin.