Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Mongolian
ᠪᠢ
←
Proto-Mongolic
*bi
(inherited)
→
Mongolian
би
(inherited)
→
Mongolian
ᠪᠢ
(inherited)