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