Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
cnewyll
←
Proto-Celtic
*knowilos
(inherited)
←
Proto-Celtic
*knūs
(mention)
←
Welsh
cnau
(mention)
→
Welsh
cnewyllyn
(affix)