Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
merja
←
Proto-Germanic
*marjaną
(inherited)
←
Old Norse
merja
(inherited)
→
English
mar
(cognate)
→
Icelandic
mar
(mention)
→
Icelandic
margur
(mention)
→
Icelandic
marinn
(mention)