Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
gwaethaf
←
Proto-Brythonic
*gwoɨθhaβ̃
(inherited)
←
Welsh
gwaeth
(suffix)
←
Welsh
af
(suffix)