Caerferwig

Welsh

Etymology

caer (“castle”) +‎ Berwig (“Berwick”).

Proper noun

Caerferwig m

1. Berwick-upon-Tweed

   Synonym: Berwig ar Dwid

Mutation

Welsh mutation
radical	soft	nasal	aspirate
Caerferwig	Gaerferwig	Nghaerferwig	Chaerferwig
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.