Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Irish
ceól
←
Old Irish
céul
(inherited)
→
Irish
ceol
(inherited)
→
Scottish Gaelic
ceòl
(inherited)
→
Manx
kiaull
(inherited)