Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
seicheamh
←
Proto-Indo-European
*sekʷ-
(root)
←
Old Irish
seichem
(inherited)
←
Old Irish
seichithir
(mention)
→
Irish
príomhsheicheamh
(affix)
→
Irish
fosheicheamh
(affix)