Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
sgiath
←
Proto-Celtic
*skētos
(inherited)
←
Old Irish
scíath
(inherited)
→
Scottish Gaelic
sgiathach
(affix)