Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
fíu
←
Proto-Celtic
*wesus
(inherited)
←
Welsh
gwiw
(cognate)
←
Proto-Indo-European
*h₁wésus
(inherited)
←
Sanskrit
वसु
(cognate)
→
Welsh
gwiw
(cognate)
→
Irish
fiú
(inherited)
→
Scottish Gaelic
fiù
(inherited)