Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
aingid
←
Proto-Celtic
*anegeti
(inherited)
→
Old Irish
doindnaig
(affix)
→
Old Irish
adanaig
(affix)