Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
fedb
←
Proto-Celtic
*widwā
(inherited)
←
Proto-Indo-European
*h₁widʰéwh₂
(inherited)
→
English
widow
(cognate)
→
Irish
baintreach
(cognate)