Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
eanach
←
Proto-Celtic
*ɸenos
(derived)
←
Irish
-ach
(affix)
←
Proto-Indo-European
*pen-
(derived)
←
Middle Irish
enach
(inherited)
←
Old Irish
en
(derived)