Standardised Welsh Place-names list
Notes
This is the form recommended in the national standard reference work, A Gazetteer of Welsh Place-Names (University of Wales Press, 1967). One should not deviate from its recommendations without good reason.
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.
Names of settlements containing the element uchaf/isaf (‘upper/lower’) are usually written as two separate words, with the upper/lower element capitalised. The upper/lower element is placed separately when it is a differential element; however there are some standard exceptions that are well-established.