Llanbradach

Morphology: originally glan+nant+ the personal name Bradach
Phonetic: ll-anne-brad-ah-ch

"Llan" means church or parish but in this case the origin of the name comes from Glan Nant Bradach, or "the banks of river Bradach". "Bradach" is an Irish word meaning "robbing, pilfering" but a suggested meaning for the name is that the Irish -ach ending with the Welsh word "brad" meaning "treachery" or "deceit" would mean the river’s name becomes " a treacherous stream" possibly one that is prone to sudden, destructive floods – and the area does become quickly flooded after heavy rain even to this day. Another theory is that the "treachery" is that of the monk ("mynach", hence the "ach" ending here) who is mentioned in the folktale regarding Ystrad Mynach (see that entry for details) and that the name derives from Llan Brad y Mynach – or "parish of the monk’s treachery". The place name has existed in some form since at least 1597.