Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Bulgarian
окръг
←
Proto-Slavic
*okrǫgъ
(inherited)
←
Proto-Slavic
*ob-
(mention)
←
Proto-Slavic
*krǫgъ
(mention)