Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Pennsylvania German
fuffzeht
←
German
fünfzehnte
(cognate)
←
English
fifteenth
(cognate)
←
Dutch
vijftiende
(cognate)