Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
moc’h
→
Irish
muc
(cognate)
→
Scottish Gaelic
muc
(cognate)
→
Manx
muc
(cognate)
→
Old Irish
mucc
(cognate)