Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Irish
coire
←
Proto-Celtic
*kʷaryos
(inherited)
←
Proto-Celtic
*kʷaryos
(inherited(mga/sga))
←
Old Irish
coire
(inherited)
←
Old Irish
caire
(mention)
←
Old Irish
coire
(inherited(mga/sga))
→
Irish
coire
(inherited)
→
Scottish Gaelic
coire
(inherited)