Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Danish
thu
←
Proto-Germanic
*þū
(inherited)
←
Proto-Indo-European
*túh₂
(inherited)
←
Old Norse
þú
(inherited)
→
Danish
du
(inherited)