Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
eairk
←
Irish
adharc
(cognate)
←
Old Irish
adarc
(inherited)
→
Manx
eairkagh
(affix)
→
Manx
un-eairkagh
(affix)