Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
cathach
←
Old Irish
cath
(affix)
←
Old Irish
-ach
(affix)
→
Irish
cathach
(inherited)
→
Irish
cathach
(inherited)
→
Middle Irish
cathaige
(affix)