Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old East Slavic
олъ
←
Proto-Slavic
*ȍlъ
(inherited)
→
Latvian
alus
(cognate)
→
Russian
ол
(inherited)