Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
barn
←
Proto-Celtic
*barnati
(inherited)
←
Proto-Indo-European
*gʷerH-
(inherited)
→
Welsh
barnau
(affix)
→
Welsh
barnu
(affix)