Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
þrennur
←
Proto-Germanic
*þriznaz
(inherited)
←
Old Norse
þrinnr
(inherited)
→
Icelandic
fern
(mention)
→
Icelandic
þrenna
(mention)
→
Icelandic
þrenning
(suffix)