Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
beinn
←
Proto-Celtic
*benno-
(derived)
←
Old Irish
benn
(inherited)
→
Manx
ard-veinn
(prefix)