Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
fial
←
Proto-Celtic
*wēlos
(inherited)
←
Welsh
gŵyl
(cognate)
←
Proto-Indo-European
*wey-
(derived)
←
Old Irish
fíal
(inherited)
→
Irish
féile
(affix)
→
Irish
ainfhial
(affix)