Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Gaulish
gena
←
Proto-Celtic
*genus
(inherited)
←
Welsh
gen
(cognate)
←
Proto-Indo-European
*ǵénus
(derived)
←
Latin
gena
(cognate)
←
Old Irish
gin
(cognate)
←
Old Irish
giun
(mention)