Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Polish
wierny
←
Proto-Slavic
*věrьnъ
(inherited)
→
Polish
wierność
(affix)
→
Polish
wiernie
(suffix)
→
Ukrainian
вірний
(cognate)