Rathdown's speculation seems reasonable. In the past, when people moved out of an area, they often became known by the region they came from. For example, John from Kelso would become John Kelso. Another candidate may be Cowdenbeath, meaning 'birch woods' in the Gaelic. Cowdenbeath is a town and burgh in the Kingdom of Fife.
It's coming yet for a' that,
That Man to Man, the world o'er,
Shall brothers be for a' that. - RB
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