Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
North Frisian
Brain
←
Proto-Germanic
*bragną
(inherited)
←
Old Frisian
brein
(inherited)
←
Saterland Frisian
Brainge
(cognate)