Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
pesk
←
Proto-Brythonic
*pɨsk
(inherited)
←
Welsh
pysgod
(mention)
←
Cornish
pysk
(mention)
←
Latin
piscis
(derived)
→
Welsh
pysgod
(mention)
→
Irish
iasc
(mention)
→
Scottish Gaelic
iasg
(cognate)
→
Cornish
pysk
(mention)