Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
-faldur
←
Proto-Germanic
*-falþaz
(inherited)
←
Proto-Indo-European
*pel-
(derived)
←
Old Norse
-faldr
(inherited)
→
Icelandic
tvöfaldur
(mention)