Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
treysta
←
Proto-Germanic
*traustijaną
(inherited)
←
Old Norse
treysta
(inherited)
→
Icelandic
traust
(mention)