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