Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
comhéifeacht
←
Irish
comh-
(affix)
←
Irish
éifeacht
(affix)
→
Manx
co-effaght
(cognate)