Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
helgidagur
←
Icelandic
helgi
(affix)
←
Icelandic
dagur
(affix)
→
Old English
haligdæg
(cognate)