Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
leas-
←
Breton
lez-
(cognate)
←
Welsh
llys-
(cognate)
←
Manx
lhiass-
(cognate)
→
Breton
lez-
(cognate)
→
Irish
leasathair
(affix)
→
Irish
leasmháthair
(affix)
→
Irish
leasainm
(affix)
→
Irish
leasrí
(affix)