Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
féad
←
Proto-Indo-European
*steh₂-
(root)
←
Middle Irish
fétaid
(inherited)
←
Old Irish
·éta
(inherited)
←
Old Irish
ad·cota
(mention)
→
Irish
féidir
(mention)