Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
[[*bargos]], [[*barginā]]
→
Breton
bara
(inherited)
→
Welsh
bara
(inherited)
→
Irish
bairín
(inherited)