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by torstenvl 1357 days ago
Only in Russian.

In other Slavic languages it's mostly some form of ty + djen' (Polish tydzien Croatian tjedan Czech týden Belarusian тыдзень Ukrainian тиждень). But see Bulgarian (седмица seven-thing (fem.)).

I suspect (without evidence) that, in Russian, it's referring to Sundays as a way of reckoning weeks.

week:Sunday :: year:summer :: month::moon. Cf. "When I was but 10 summers old", "Many moons ago", etc.

That would fit with the use of the archaic word for Sunday as well.