Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
lac
←
Proto-Celtic
*laggos
(inherited)
←
Proto-Indo-European
*(s)leh₁g-
(derived)
→
English
lage
(derived)
→
Irish
lag
(inherited)
→
Scottish Gaelic
lag
(inherited)