Blue Byrn spelling

I've seen alternative maps spelling it as "Blue Byrn" , two words and using a "y". The HBO map does say "Blueburn" but this wouldn't be the first mistake they've made. The ADWD map also says "Blueburn" so I wonder what lies behind this discrepancy.

While I'm on the subject, have they ever named the tributary of the Mander running north to Silverhill?--The Dragon Demands 22:35, May 13, 2012 (UTC)

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