Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
uathadh
←
Proto-Indo-European
*h₂ewtos
(derived)
←
Old Irish
[[úathad]], [[óthad]], [[úaithed]]
(inherited)