Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
trist
←
Latin
trīstis
(borrowed)
→
Breton
trist
(cognate)
→
Welsh
tristed
(suffix)
→
Welsh
tristach
(suffix)
→
Welsh
tristaf
(suffix)
→
Welsh
pendrist
(affix)