Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
-ni
←
Proto-Celtic
*snīs
(inherited)
←
Welsh
ni
(cognate)
→
Old Irish
adaig
(mention)
→
Old Irish
triunni
(affix)
→
Old Irish
dínni
(affix)