Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
goolan
←
Breton
gouelan
(cognate)
←
Proto-Brythonic
*gwuɨlann
(inherited)
←
Proto-Celtic
*wailannā
(inherited)
←
Welsh
gwylan
(cognate)
←
Irish
faoileán
(cognate)
→
English
gull
(cognate)
→
Welsh
gwylan
(cognate)