Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
sinni
←
Proto-Celtic
*snisni
(inherited)
←
Proto-Celtic
*snīs
(mention)
←
Welsh
nini
(cognate)
←
Welsh
ni
(mention)
→
Irish
sinn
(inherited)
→
Scottish Gaelic
sinn
(inherited)
→
Manx
shin
(inherited)
→
Old Irish
dúnn
(mention)