Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
pecthach
←
Old Irish
peccad
(affix)
←
Old Irish
-ach
(affix)
→
Irish
peacach
(inherited)
→
Scottish Gaelic
peacach
(inherited)