Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
consecha
←
Proto-Celtic
*sekʷeti
(derived)
←
Proto-Indo-European
*sekʷ-
(root)
←
Old Irish
com-
(affix)