Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Irish
maccoím
←
Middle Irish
macc
(affix)
←
Middle Irish
cóem
(affix)
←
Old Irish
macc coím
(inherited)
→
Irish
macaomh
(inherited)