Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*toranos
→
English
Taranis
(derived)
→
Welsh
taran
(derived)
→
Irish
torann
(inherited)
→
Irish
toirneach
(derived)