Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
sheeiney
←
Proto-Celtic
*sɸenyos
(inherited)
←
Old Irish
sine
(derived)
→
Manx
sheeintagh
(affix)