Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*durnos
→
Breton
dorn
(inherited)
→
Welsh
dwrn
(inherited)
→
Irish
dorn
(inherited)
→
Scottish Gaelic
dòrn
(inherited)
→
Galician
dorna
(derived)
→
Cornish
dorn
(inherited)