Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
meri
←
Proto-Germanic
*marhijō
(derived)
←
Old Norse
merr
(derived)
→
English
mare
(cognate)
→
Luxembourgish
Mier
(cognate)