Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
renaid
←
Proto-Celtic
*rinati
(inherited)
→
Irish
reic
(mention)
→
Scottish Gaelic
reic
(mention)
→
Old Irish
asren
(affix)