Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
traws-
←
Cornish
treus-
(cognate)
→
Welsh
trawstrefa
(affix)
→
Welsh
trawsblannu
(affix)