Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
Sabhrainn
←
Proto-Celtic
*Sabrinā
(derived)
←
Welsh
Hafren
(cognate)
→
Welsh
Hafren
(cognate)