Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
trydan
←
Breton
tredan
(cognate)
←
Welsh
try-
(affix)
←
Welsh
tân
(affix)
←
Cornish
tredan
(cognate)
→
Welsh
trydanwr
(suffix)