Did medieval Jewish leaders encourage people to adopt those names?
Gold
Names involving rubies, silver, gold and diamonds, pears, apples or poetic names like rose-flower or, say, color-of-the-sky Alexander Beider termed "ornamental" Jewish names. They first appear when names for Jews were made obligatory in the late 18th century in Eastern Europe.
It might be a reaction on disgusting names previously forced on the Jews in Austria and in some other German states.
hi! fyi, you can get started on this earlier post