Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*awV-
→
Breton
avu
(inherited)
→
Welsh
afu
(inherited)
→
Irish
ae
(inherited)
→
Scottish Gaelic
adha
(inherited)
→
Middle Irish
áe
(inherited)