Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
fiú
←
Proto-Celtic
*wesus
(inherited)
←
Proto-Indo-European
*h₁wésus
(inherited)
←
Old Irish
fíu
(inherited)
→
Irish
fiús
(affix)