Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
doformaig
←
Proto-Celtic
*maketi
(derived)
←
Proto-Indo-European
*meh₂ḱ-
(derived)
←
Old Irish
to-
(affix)
←
Old Irish
for-
(affix)