Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
feddan
←
Irish
feadán
(cognate)
←
Irish
fead
(cognate)
←
Irish
feadóg
(mention)
←
Old Irish
fetán
(inherited)
←
Old Irish
fet
(mention)