Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Primitive Irish
ᚂᚒᚌ
←
Proto-Celtic
*Lugus
(inherited)
←
Primitive Irish
*ᚂᚒᚌᚒᚄ
(mention)
→
English
Lugh
(derived)
→
Irish
Lugh
(inherited)
→
Old Irish
Lug
(inherited)