Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
molt
←
Gaulish
*multon-
(cognate)
←
Proto-Celtic
*molto-
(inherited)
←
Welsh
mollt
(cognate)
←
Old Irish
molt
(inherited)