Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
serch
←
Ancient Greek
στέργω
(cognate)
←
Proto-Indo-European
*sterg-
(inherited)
→
Welsh
serchog
(affix)