Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
eik
←
Proto-Germanic
*aiks
(derived)
←
Proto-Indo-European
*h₂eyǵ-
(root)
←
Proto-Indo-European
*h₂eyǵ-
(derived)
←
Old Norse
eik
(derived)
→
Cimbrian
aicha
(cognate)
→
Luxembourgish
Eech
(cognate)