It depends on context and sound (I think, you pronounce "w" in "grow" a bit not as "w" in "west", for example). Watson (who's doctor and friend of Sh. Holmes) could be written in Russian either as "Уотсон" or as "Ватсон".

There is no "W" letter or sound in russian. The sound like russian "у"

That would be "диваш", whatever it means.

I think that Divash is Диваш in Russian transcription.

This word or his analog doesn't exist in Russian language. Try to specify it.