I came across this earlier - a lovely article from the Guardian, all about a literary doubles, which made me giggle for ages at the absurdity of it all (check out the section about the Duncan Campbells and you'll see what I mean...).
I don't think there's another one of me, so I'm quite lucky. It must be very difficult if you're writing in one genre, and suddenly appear to have written a Mills and Boon or something even more random happens like becoming the UK windsurfing champion or owning prize-winning chihuahuas.
I've checked, anyway. If you look up "Rach Colling" on Google, all the search results relate to me. There's a few more under "Rachael Colling", only one of which (the BBC article) I can claim, although they're mainly confined to facebook.
What's strange, is if you look under my old name, Rachael Bradley. I've apparently written books about dragons (as well as my own thrilling tomes about writing for the web or international boundary issues), appeared in a little-known comedy called Brothers, and I'm also a chef and olive oil expert.
Even odder, I was a character in Cold Feet. Which made it very strange to watch.