Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*yextis
→
Breton
joke
(inherited(br/en))
→
Breton
yezh
(inherited)
→
Welsh
iaith
(inherited)
→
Cornish
yeth
(inherited)