Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Irish
gúal
←
Proto-Celtic
*gowlos
(inherited)
←
Proto-Celtic
*gowlā
(mention)
←
Proto-Indo-European
*ǵwelH-
(derived)
→
Middle Irish
gúalach
(suffix)