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