Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
seinn
←
Proto-Celtic
*swannati
(inherited)
←
Proto-Indo-European
*swenh₂-
(derived)
←
Middle Irish
sendim
(inherited)
←
Old Irish
seinnid
(mention)
→
Irish
seinnteoir
(affix)