Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
costas
←
Middle English
cost
(borrowed)
←
Irish
-as
(affix)
→
Irish
fochostas
(affix)
→
Irish
costasach
(affix)
→
Irish
costasacht
(affix)
→
Irish
costasúil
(affix)