Notes
The hyphen is used in Welsh place-names in order to aid pronunciation by showing that stress does not fall on the penultimate syllable. The stress falls on the final syllable of this name and therefore the final syllable is preceded by a hyphen.
If the difference between the ‘Welsh form’ and the 'English form’ consists of only one or two letters, the use of a single form is recommended, with preference being given to the ‘Welsh form’. This accords with the recommendations of the Ordnance Survey and the Highway Authorities.