Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Polish
-ęcy
→
Polish
dziecięcy
(affix)
→
Polish
jagnięcy
(affix)
→
Polish
bydlęcy
(affix)