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Can't think of any other explanation
Maybe there is a link to your site somewhere with your name as anchor text
Look harder! There are 8,058,044,651 web pages out there.
Do a search in Yahoo for "link:http://yoursitename.co.uk surfgatinho". Have a look at the html source of the third result - you'll find a link to the site in question as follows:
<a href="http://yoursitename.co.uk">Visit surfgatinho's homepage!</a>