Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*waytos
→
Breton
gwad
(inherited)
→
Welsh
gwaed
(inherited)
→
Cornish
goes
(inherited)
→
Cornish
goos
(inherited)