Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
crú
←
Proto-Celtic
*krowos
(inherited)
←
Proto-Indo-European
*kréwh₂s
(inherited)
→
Irish
cró
(inherited)