Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
faasaag
←
Irish
féasóg
(cognate)
←
Middle Irish
fésóc
(inherited)
→
Manx
faasaagagh
(affix)