Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
nith
←
Proto-Brythonic
*nėθ
(inherited)
←
Proto-Celtic
*nextī
(inherited)
←
Proto-Indo-European
*néptih₂
(inherited)
→
Welsh
cyfnither
(affix)