Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
lacha
←
Scottish Gaelic
lach
(cognate)
←
Manx
laagh
(cognate)
←
Old Irish
lachu
(inherited)
→
Irish
lachín
(suffix)
→
Scottish Gaelic
lach
(cognate)