Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
commyn
←
Old Irish
commann
(inherited)
→
Manx
keird-chummyn
(affix)
→
Manx
cummynys
(suffix)