Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
arragh
←
Proto-Celtic
*wesrakos
(inherited(ga/gv))
←
Proto-Celtic
*wesr-
(derived(ga/gv))
←
Proto-Indo-European
*wósr̥
(derived(ga/gv))
←
Old Irish
errach
(inherited(ga/gv))