Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
traf
←
Proto-Germanic
*trabō
(derived)
←
Old Norse
traf
(inherited)
←
Old Norse
trǫf
(derived)
→
Icelandic
trefill
(suffix)