Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*nekʷos
→
Welsh
neb
(inherited)
→
Manx
nagh
(inherited)
→
Old Irish
nach
(inherited)
→
Old Irish
nech
(inherited)