Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
math
←
Gaulish
-
(cognate)
←
Gaulish
Matugenos
(mention)
←
Proto-Celtic
*matus
(inherited)
←
Proto-Celtic
*matis
(mention)
←
Celtiberian
matus
(cognate)