FromMiddle Welshbwch, fromProto-Brythonic*bux, fromProto-Celtic*bukkos, ultimately fromProto-Indo-European*bʰuǵkos.
| radical | soft | nasal | aspirate |
|---|---|---|---|
| bwch | fwch | mwch | unchanged |
Note: Certain mutated forms of some words can never occur in standard Welsh.
All possible mutated forms are displayed for convenience.