"My other question is about the American rendering of the initial Узд as Usd rather than Uzd. I have come across at least three Usdansky lines in the United States"

Us- is less 'foreign' than Uz- in America, so it doesn't actually matter. 

My second rule of genealogy, when I taught it, was "spelling doesn't count"

Clerks in the US and Poland / Russia and elsewhere spelled what they heard. My grandmother's birth record in NYC says her mother's maiden name was Livingston - it was Löwenstein, but say it with a German accent and listen with an English ear, and that explains it.

Sally Bruckheimer
Princeton, NJ