They say the week starts on Sunday, right ?

I personally have a hard time with that… and the guys who invented the word “week-end” as well. Because Saturday and Sunday are the two endS of… two different weeks, no ?
So we should call it “the week-endS”, right ?

In French, you would use “week-end” too (sometimes playfully spelled “ouiquende”)…
most French don’t go for the very official “fin de semaine” !