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In my region there is a mixture of persian and turk languages, and a lot of words got into both.

Амударья и Сырдарья?[/quote]

yep, any river is a dariya, unless it is a creek, then it is сай.

The name obviously is Russian, the origin is not quite known to me, I am not an expert, but in turk languages that means River. I guess that could be origin.