Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
hel
←
Old Irish
selg
(cognate)
→
Welsh
helynt
(affix)
→
Welsh
helwr
(suffix)
→
Welsh
helwyr
(affix)