Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
llên
←
Breton
lenn
(cognate)
←
Proto-Brythonic
*lleɣenn
(inherited)
←
Latin
legendum
(derived)
←
Old Irish
légend
(cognate)
←
Middle Welsh
llen
(inherited)
→
Breton
lenn
(cognate)
→
Welsh
llenyddol
(suffix)
→
Welsh
llenydda
(suffix)