Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Church Slavonic
веселъ
←
Proto-Slavic
*veselъ
(inherited)
→
Old Church Slavonic
весельѥ
(affix)
→
Lower Sorbian
wjasoły
(cognate)
→
Latvian
vesels
(cognate)