Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
ógánach
←
Irish
-ach
(affix)
←
Irish
óg
(mention)
←
Middle Irish
ógán
(inherited)
←
Old Irish
ócán
(inherited)
←
Old Irish
óc
(mention)