Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*lowtus
→
Breton
ludu
(inherited)
→
Welsh
lludw
(inherited)
→
Irish
luaith
(inherited)
→
Middle Irish
lúaith
(inherited)