Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
ifanc
←
Proto-Brythonic
*jowank
(inherited)
←
Proto-Celtic
*yowankos
(inherited)
←
Welsh
iefanc
(mention)
←
Welsh
ieuanc
(doublet)
←
Proto-Indo-European
*h₂yuh₁n̥ḱós
(inherited)
→
Welsh
ieuanc
(doublet)