Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
tað
←
Proto-Germanic
*tadą
(inherited)
←
Old Norse
tað
(inherited)
→
English
tath
(cognate)
→
Finnish
tade
(cognate)
→
Icelandic
teðja
(mention)