Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
seanmhair
←
Irish
seanmháthair
(cognate)
←
Manx
shennvoir
(cognate)
←
Old Irish
senmáthair
(inherited)
←
Old Irish
sen
(mention)
←
Old Irish
máthair
(mention)
→
Irish
seanmháthair
(cognate)