Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Prussian
seyr
←
Proto-Balto-Slavic
*śḗr
(inherited)
←
Proto-Indo-European
*ḱḗr
(inherited)
→
Latvian
sirds
(cognate)