Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
mel
←
Proto-Celtic
*meli
(inherited)
←
Welsh
mêl
(cognate)
←
Proto-Indo-European
*mélid
(inherited)
←
Latin
mel
(cognate)
←
Old Irish
mil
(cognate)
→
Scottish Gaelic
mil
(cognate)