Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
svanur
←
Proto-Germanic
*swanaz
(derived)
←
Proto-Indo-European
*swen-
(derived)
←
Old Norse
svanr
(derived)
→
Icelandic
svartsvanur
(mention)