Ghetto

This question seems to imply that Ghetto was the proper name (as in a proper noun) of an area of Venice that Jews were forced to live in from 1516 onwards. I don't think this is the case; what actually seems to have happened is that the area in question (which doesn't seem to have had a name previously) became known during that time as 'the Ghetto'.

The assertion that this was the first ghetto, and all other ghettoes were named after it, is not in dispute.

The origin of the word is obscure; Wikipedia gives four possibilities – of which the most likely is that it comes from a Germanic word that simply means a street (Gasse in German, gata in Swedish, and gatwo in Gothic).