Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
failc
←
Proto-Celtic
*wolk-
(derived)
←
Middle Irish
failc
(inherited(gd/ga))
←
Middle Irish
failc
(inherited)
←
Old Irish
folcaid
(inherited)