Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Kashubian
serzpiéń
←
Czech
srpen
(cognate)
←
Kashubian
serzp
(affix)
←
Kashubian
-éń
(affix)
←
Polish
sierpień
(cognate)
←
Serbo-Croatian
srpanj
(cognate)