Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
marbaid
←
Proto-Celtic
*marwāti
(inherited)
←
Old Irish
marb
(affix)
←
Old Irish
-aid
(affix)
→
Irish
maraigh
(derived)
→
Old Irish
uilemarbaid
(affix)