Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Irish
fuil
←
Proto-Celtic
*wolis
(inherited)
←
Proto-Indo-European
*welh₃-
(root)
←
Old Irish
fuil
(inherited)
→
Irish
fuil
(inherited)
→
Scottish Gaelic
fuil
(inherited)
→
Middle Irish
flann
(mention)