Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Irish
coitchenn
→
Irish
coiteann
(inherited)
→
Scottish Gaelic
coitcheann
(inherited)
→
Manx
cadjin
(inherited)