Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Irish
cúan
←
Proto-Celtic
*kawnos
(inherited)
←
Proto-Indo-European
*keh₂p-
(root)
←
Proto-Indo-European
*keh₂p-
(mention)
←
Old Irish
cúan
(inherited)
→
Irish
cuan
(inherited)
→
Scottish Gaelic
cuan
(inherited)
→
Manx
keayn
(inherited)