Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
cíor
←
Proto-Celtic
*kīnsrā
(inherited)
←
Old Irish
cír
(inherited)
→
Greek
ξαίνω
(cognate)
→
Irish
déadchíor
(affix)