Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
West Frisian
seis
←
Proto-Germanic
*sehs
(inherited)
←
Proto-Indo-European
*swéḱs
(inherited)
←
Old Frisian
sex
(inherited)
→
English
six
(cognate)
→
North Frisian
seeks
(cognate)
→
North Frisian
soks
(cognate)
→
Saterland Frisian
säks
(cognate)