Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*miskos
→
Welsh
mysg
(derived)
→
Welsh
cymysg
(inherited)
→
Irish
meisce
(derived)
→
Manx
meshtey
(derived)
→
Old Irish
mescc
(inherited)