Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Czech
něco
←
Czech
ně
(prefix)
←
Czech
co
(prefix)
→
Lower Sorbian
něco
(cognate)
→
Polish
co nieco
(cognate)