Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Bulgarian
черен
←
Old Church Slavonic
чрьнъ
(inherited)
←
Proto-Indo-European
*kr̥snós
(inherited)
←
Proto-Slavic
*čьrnъ
(inherited)