Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Norse
rjóðr
←
Proto-Germanic
*reudaz
(inherited)
←
Proto-Germanic
*reudaną
(inherited)
→
Westrobothnian
ru
(inherited)
→
Swedish
Rydberg
(derived)