(orginally nant + the personal name Bradach)
'Llan' means church or parish but in this case the origin of the name comes from 'Nant Bradach', or 'the banks of river Bradach'. 'Bradach' is an Irish word meaning robbing, pilfering, but a possible interpretation is the Irish '-ach' ending, with the Welsh word 'brad', meaning treachery or deceit. This would mean the river’s name becomes 'a treacherous stream', possibly one that is prone to sudden, destructive floods. The place name has existed in some form from at least 1597.
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