Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
German
seichen
→
German
sicken
(cognate)
→
German
sickig
(cognate)
→
Luxembourgish
seechen
(cognate)
→
Dutch
zeiken
(cognate)