Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Lower Sorbian
pjac
←
Proto-Indo-European
*pekʷ-
(derived)
←
Proto-Slavic
*peťi
(inherited)
→
Lower Sorbian
pjakaŕ
(suffix)