Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Frisian
fiūr
→
West Frisian
fjoer
(inherited)
→
Old Saxon
fiur
(cognate)
→
Saterland Frisian
Fjúur
(inherited)