Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Polish
styczeń
→
Polish
styczniowy
(suffix)
→
Polish
Styczeń
(mention)
→
Russian
сечень
(cognate)
→
Ukrainian
січень
(cognate)