Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
sjöundi
←
Proto-Germanic
*sebundô
(derived)
←
Old Norse
sjaundi
(derived)
→
Icelandic
átti
(mention)
→
Icelandic
áttundi
(mention)