I'm surprised that you're having trouble finding reliable sources containing her birth name. It took ne 10 seconds to find the Guardian article (cited) which talks at length about her birth name. I see articles in the Telegraph, The Daily Mail (she's apparently suing the Mail for claiming Jack is not her 'real' name - sound trivial?), The Independent, Pink News and... in pieces (plural) her own website. The subject seems to think it's relevant but you don't? How odd. It's staying unless arbitration says otherwise. 82.41.251.96