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