Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
Tadg
←
Proto-Celtic
*tazgos
(inherited)
←
Old Irish
tadg
(mention)
→
Manx
Taig
(inherited)
→
Old Norse
Taðkr
(derived)