Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
gwyrdh
←
Proto-Brythonic
*gwɨrð
(inherited)
←
Middle Cornish
gwirdh
(inherited)
←
Latin
viridis
(derived)
←
Old Cornish
guirt
(inherited)