Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
skian
←
Proto-Celtic
*skētos
(derived)
←
Middle Irish
scíathán
(inherited)
←
Old Irish
scíath
(derived)
→
Manx
neuskianagh
(affix)
→
Manx
skianagh
(affix)