Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Church Slavonic
слѣдъ
←
Proto-Slavic
*slědъ
(inherited)
←
Proto-Slavic
*slědъ
(inherited(cu/orv))
→
Old Church Slavonic
послѣдъкъ
(confix)