Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
umae
←
Proto-Celtic
*omiyom
(inherited)
←
Welsh
efydd
(cognate)
←
Old Welsh
emid
(cognate)
→
Welsh
efydd
(cognate)