Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
West Frisian
sânde
←
Proto-Germanic
*sebundô
(inherited)
←
Old Frisian
sigunda
(inherited)
→
North Frisian
sööwenst
(cognate)