Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
cum
←
Irish
cuma
(mention)
←
Old Irish
cummaid
(inherited)
←
Old Irish
cummae
(mention)
→
Irish
chum
(mention)