Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Polish
kędy
←
Czech
kudy
(cognate)
←
Russian
куда
(cognate)
←
Serbo-Croatian
kuda
(cognate)
←
Proto-Slavic
*kǫda
(inherited)
→
Russian
куды
(cognate)