We keep on going in circles with this. Israel does not call Sunday "Sunday". Israeli Jews call " Sunday" yom rishon (first day). For Israeli's the weekend is Friday and Saturday. Even if non-Jews in Israel don't believe that it is, They follow it anyway. Why? For the most part: Little to no customers. Also keep in mind that all gov't agencies are closed and all public transportation are stopped usually by early afternoon of Friday and completely on Saturday.
My Hebrew Dictionary: Days of the Week
And as for Arabs; No matter how much they attempt to separate themselves from Jews, their language has nearly the same root. Saturday in Arabic is "as sabt" which is "shabbat" in Hebrew. Sunday in Arabic is " al ahad" which is "ahat" (one) in Hebrew. Fwiw, Arab Muslims close all their businesses early Friday afternoon for the weekly call to prayer. Even though it's only a few hours, most don't reopen. This is similar to Christians who don't open Sunday morning as that is when they do their prayers, but when it's over they open their businesses.
Days of the Week in Arabic - For Dummies
Hebrew Numbers 1-10 flashcards | Quizlet