Where does “seif” come from?

seif (English) comes from Arabic سَيْف, from Arabic سَيْف اَلْجَبَّار — sword of the giant.

seif (English): A sand dune that elongates parallel to the...

Definitions

Step	Language	Word	Meaning
1	Arabic	سَيْف	sword
2	Arabic	سَيْف اَلْجَبَّار	sword of the giant

seif — Etymology, Origin & Word History | Etymology Explorer