Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
heilagur
←
Proto-Germanic
*hailagaz
(inherited)
←
Old Norse
heilagr
(inherited)
→
Alemannic German
heilig
(cognate)
→
Icelandic
helgi
(link)
→
Icelandic
helgi
(link)
→
Pennsylvania German
heilich
(cognate)