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

Norwegian Bokmål due (mention)
Norwegian Bokmål dd (link)
Norwegian Bokmål duing (mention)