Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
comthrom
→
Irish
cothrom
(inherited)
→
Irish
cothromas
(mention)
→
Scottish Gaelic
cothrom
(inherited)
→
Scottish Gaelic
cudrom
(inherited)