Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Welsh
guetid
←
Proto-Brythonic
*gwetɨd
(inherited)
←
Proto-Celtic
*weteti
(inherited)
←
Proto-Indo-European
(inherited)
←
Proto-Indo-European
*weth₂-
(suffix)
←
Proto-Indo-European
*eti
(suffix)