Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Mongolian
-в
→
Mongolian
-вч
(compound)
→
Mongolian
-вал
(compound)
→
Kalmyk
-в
(cognate)