Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
dúnadh
←
Irish
dún
(suffix)
←
Irish
adh
(suffix)
←
Old Irish
dúnad
(inherited)
→
Manx
dooney
(cognate)