Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Pictish
ᚒᚏᚏᚐᚉᚈ
←
Proto-Celtic
*wregeti
(inherited)
←
Welsh
gwnaeth
(cognate)
←
Old Welsh
guract
(cognate)