Looking at <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Names_of_the_days_of_the_week#Numbered_days_of_the_week" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Names_of_the_days_of_the_week#...</a>, it appears that almost every language which numbers the days of the week starts on Sunday, with the exception of some Slavic languages (which use Monday) and Swahili (which uses Saturday).