Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
lagg
←
Proto-Celtic
*luggo-
(derived)
←
Greek
λυγίζω
(cognate)
←
Irish
lag
(cognate)
←
Proto-Indo-European
*lewg-
(derived)
→
Manx
lagg-hooillagh
(affix)