Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
meddw
←
Proto-Celtic
*medwos
(inherited)
←
Proto-Celtic
*medu
(derived)
←
Proto-Indo-European
*médʰu
(inherited)
→
Welsh
meddwol
(affix)
→
Welsh
meddwyn
(affix)
→
Welsh
meddwi
(affix)