I recently met someone named Станислау, and couldn't figure out what his children's отчество would be. I know that for Станислав it is obviously Станиславович, but "Станислауович" sounds awkward to me. I know that one (for male) generally adds -ович unless the name ends in -ь or -й, for which -евич is used. But is there an exception for this name? What is he correct отчество?
Additionally, is this name still used? I have never seen it before, outside of this one person and some textbooks.