Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
West Frisian
wat
←
Proto-Germanic
*hwat
(inherited)
←
Proto-Indo-European
*kʷód
(inherited)
←
Old Frisian
hwet
(inherited)
→
English
what
(cognate)
→
Dutch
wat
(cognate)