The etymology of the word ghetto has long been debated. Several solutions have been offered. The very first use of the word has been traced back to 1516 to the Jewish area of Venice. There, residents will proudly tell you that ghèto meant 'foundry'. The problem is that it seems strange to name an area after one foundry and not 'foundries, because there must have been more than one.
Other suggestions are that it originates from the Yiddish gehektes ('enclosed'), from the Italian borghetto ('little town') or from the Old French guect ('guard'). All these suggestions eventually fail, mostly because of phonetics.
But in Dutch language we find several words that describe a steeg ('alley'). In the southernmost province of Limburg a steeg is called a gats. That changes to gas in the city of Nijmegen, and finally to steiger in Enkhuizen in the north. Both steeg ('alley') and steiger ('jetty') are related to stijgen or 'to rise up'.
In English we discover that 'jetty' ('pier') also once had the meaning of 'a passage between two houses' in central and northern England.
During my research for this article I found a text by Anatoly Liberman that seemed to have traveled much the same route as I did.