Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
dubach
←
Old Irish
dubae
(suffix)
←
Old Irish
ach
(suffix)
→
Irish
dubhach
(inherited)
→
Irish
dubhach
(inherited)
→
Scottish Gaelic
dubhach
(inherited)