Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Serbo-Croatian
neka
←
Polish
niech
(mention)
←
Slovak
nech
(mention)
←
Proto-Slavic
*nekъ
(inherited)
→
Polish
niech
(mention)
→
Polish
niechaj
(mention)