[Asooka]

Having Sunday as the first day would mess up our week, because we call Tuesday, Thursday and Friday second, fourth and fifth respectively. If you really want 1st each month to be first day of week, either America will have to adopt Monday as first, or vary the day of week by region.

[filmor]

Wednesday is called "Mittwoch" in German, which is a shortened form of "middle of the week". Only works if Sunday is the first day of the week, though the common convention is also having the week start on Monday. Confused me quite a bit as a child :)

[usrusr]

Middle of the working days part of the week, no need to go all American and make half of the weekend the beginning!

[galfarragem]

The same in Portuguese: Monday = Segunda (Second); Tuesday = Terça (Third) and successively till Friday = Sexta (Sixth).