Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Mongolian
эгч
←
Dongxiang
egvechi
(cognate)
←
Proto-Mongolic
*egeci
(inherited)
→
Mongolian
эх
(doublet)
→
Dongxiang
egvechi
(cognate)