Hold on a minute. He was actually using Marr's birthname and making a point in doing so. Johnny Marr was born Johnny Maher: http://www.nme.com/news/johnny-marr/67272 Marr changed his name because of how Maher was being pronounced. The Gallaghers have their second names predominantly pronounced as 'Gallacher' and that's the point he was making.
As far as a birth cert is concerned, the author was on the money.
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