Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
eithr
→
Welsh
dieithr
(prefix)
→
Irish
eachtra
(cognate)
→
Scottish Gaelic
eachdraidh
(cognate)
→
Scottish Gaelic
eachtradh
(cognate)