Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
teaghlach
←
Irish
teach
(mention)
←
Irish
slua
(mention)
←
Old Irish
teglach
(inherited)
→
Welsh
teulu
(cognate)
→
Cornish
teylu
(cognate)