Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
tongaid
←
Proto-Celtic
*tongeti
(inherited)
←
Proto-Indo-European
*teh₂g-
(derived)
←
Old Irish
as·toing
(mention)
→
Old Irish
astoing
(mention)