Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
eiður
←
Proto-Germanic
*aiþaz
(derived)
←
Proto-Indo-European
*oyt-
(derived)
←
Old Norse
eiðr
(derived)
→
Luxembourgish
Eed
(cognate)