hefte

week, a period of seven days

Derives from Avestan hepta "seven", meaning a period of seven days.

From PIE *septm "seven"

Hindi saptaah
Sanskrit saptāhaḥ,
Dari هفته,
Persian هفته (hfth),
Tajik ҳафта هفته (hafte)

See heft.

Turkish hafta "week"