Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
West Frisian
-sk
←
Proto-Germanic
*-iskaz
(derived)
←
Old Frisian
-isk
(derived)
→
West Frisian
hjoeddeisk
(affix)