Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*wid-
→
Breton
gouzout
(derived)
→
Welsh
gwybod
(derived)
→
Cornish
godhvos
(derived)