Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
fáistine
←
Proto-Indo-European
*weh₂t-
(root)
←
Middle Irish
fáistine
(inherited)
←
Old Irish
fáithsine
(inherited)