Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Church Slavonic
вѣчьнъ
←
Old Church Slavonic
вѣкъ
(suffix)
←
Old Church Slavonic
ьнъ
(suffix)
←
Proto-Slavic
*věčьnъ
(inherited)