Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*widukʷēslā
→
Old Irish
ficheall
(inherited(sga/ga))
→
Old Irish
gwyddbwyll
(inherited(sga/cy))
→
Old Irish
fidchell
(derived(sga/en))