Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Vietnamese
蠬
←
Proto-Vietic
*-roːŋ
(inherited)
←
Old Chinese
-
(cognate)
→
Vietnamese
rồng
(inherited)