Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Indo-European
*dʰéǵʰom-yo-
→
Breton
den
(inherited)
→
Manx
dooinney
(inherited)
→
Cornish
den
(inherited)