Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
llyfu
←
Proto-Celtic
*ligeti
(inherited)
←
Irish
ligh
(cognate)
←
Proto-Indo-European
*leyǵʰ-
(derived)
←
Old Irish
ligid
(cognate)