Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
doaisféna
←
Proto-Celtic
*wetnati
(derived)
←
Proto-Indo-European
*weth₂-
(derived)
←
Old Irish
to-
(affix)
←
Old Irish
ess-
(affix)
←
Old Irish
as·féna
(mention)