FromEnglishcuckoo, fromMiddle Englishcokkou, probably fromOld Frenchcocu, ultimatelyonomatopoeic, perhaps viaLatincucūlus(“cuckoo”).
The alternative formgwcw (attested already inMiddle Welsh) is a blend of Middle Englishcokkou andgoke (see Englishgowk).
| radical | soft | nasal | aspirate |
|---|---|---|---|
| cwcw | gwcw | nghwcw | chwcw |
Note: Certain mutated forms of some words can never occur in standard Welsh.
All possible mutated forms are displayed for convenience.