Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
dolega
←
Proto-Celtic
*dīlegāti
(inherited)
←
Welsh
dileu
(cognate)
←
Old Irish
dí-
(affix)
←
Old Irish
legaid
(affix)