Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Lower Sorbian
něco
←
Czech
něco
(cognate)
←
Polish
nieco
(cognate)
←
Proto-Slavic
*něčьto
(inherited)