Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
seithfed
←
Proto-Brythonic
*seɨθβ̃ed
(inherited)
←
Proto-Celtic
*sextametos
(inherited)
←
Welsh
saith
(affix)
←
Welsh
-fed
(affix)
→
Welsh
seithfed ar hugain
(compound)