Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
cogydd
←
Welsh
cog
(suffix)
←
Welsh
-ydd
(suffix)
←
Proto-Indo-European
*pekʷ-
(root)
→
Welsh
cogyddes
(suffix)