Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
dartaid
←
Proto-Celtic
*daryeti
(derived)
←
Old Irish
dairt
(mention)
←
Old Irish
dairid
(mention)
←
Old Irish
-id
(affix)