Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Frisian
hwet
→
Old English
hwæt
(cognate)
→
West Frisian
wat
(inherited)
→
Old Norse
hvat
(cognate)
→
Old Saxon
hwat
(cognate)