Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
síabair
←
Proto-Celtic
*sēbaris
(inherited)
←
Proto-Celtic
*sēbaros
(mention)
←
Old Irish
síabraid
(mention)
→
Old Irish
Finnabair
(affix)