Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Low German
rikj
←
Proto-Germanic
*rīkijaz
(inherited(nds/pdt))
←
Middle Low German
rîk
(inherited(nds/pdt))
←
Proto-West Germanic
*rīkī
(inherited(nds/pdt))
←
Old Saxon
rīki
(inherited(nds/pdt))