Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Bulgarian
тогава
←
Bulgarian
-ва
(affix)
←
Proto-Slavic
*tъgъda
(derived)
→
Bulgarian
тогавашен
(affix)