Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
dord
←
Proto-Celtic
*dor-d-
(inherited(sga/mga))
→
Irish
dord
(inherited)
→
Old Irish
dordaid
(affix)
→
Old Irish
Derdriu
(mention)