Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
e-lyfr
←
Welsh
e-
(affix)
←
Welsh
llyfr
(affix)
→
Welsh
e-lyfrau
(affix)
→
Cornish
elyver
(cognate)