Berwig ar Dwid

== Welsh == === Alternative forms === Berwig ar Twid (avoiding mutation in a foreign name) Berwig ar Duedd (using the native name for the river) === Etymology === Learned borrowing from English Berwick-upon-Tweed. The simplex Berwig was probably inherited from an ordinary borrowing into Middle Welsh or earlier. === Pronunciation === IPA(key): /ˈbɛrwɪɡ ar ˈdwiːd/ === Proper noun === Berwig ar Dwid m (obsolete) Berwick-upon-Tweed Synonym: Caerferwig === Mutation ===