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