Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
basht
←
Irish
baist
(cognate)
←
Middle Irish
baistid
(inherited)
←
Old Irish
baithsid
(inherited)
←
Old Irish
baitsid
(mention)
←
Old Irish
baithis
(mention)
←
Old Irish
baithes
(mention)
←
Old Irish
bathais
(mention)