Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
crann
←
Proto-Celtic
*kʷresnom
(inherited)
←
Welsh
pren
(cognate)
→
Irish
crann
(inherited)
→
Irish
crann
(inherited(ga/gd))