Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
câr
←
Proto-Brythonic
*kar
(inherited)
←
Proto-Celtic
*karants
(inherited)
←
Welsh
cara
(alter)
←
Welsh
cariff
(alter)
←
Welsh
carith
(alter)
←
Welsh
(alter)
←
Welsh
literary
(alter)
→
Welsh
cartref
(compound)