Hello Lynda,
You certainly pack a lot into a post.
Yes, Noah and Judah could have been brothers; a theory well worth pursuing. However, Judah's father was recorded as 'Isaac Lemplik' in the Jewish records, whereas Noah's was 'Isaac from Karg', i.e. a clear attempt was made to distinguish between the two Isaacs.
What is the significance of 19 Love Court?
I do not fully understand what you are saying here:
The reason is that the men in my Davis family were adamant the Davis' were from Russia or Poland, which could have been mispronounced instead of Prussia, which was part of Poland, Russia and Germany. They were NOT known as Davis until they came to England but no one knew their real surname. I knew I had to find a grave if I ever had a chance of finding out what their real name was.
The reason for what?
London's 18th century Ashkenazi Jewish community was an immigrant community, all of them originating in Holland, the German-speaking territories or parts of Poland. You are quite right in saying that Davis was the surname adopted in England, as Ashkenazi Jews did not adopt fixed surnames until the early 19th century. I would speculate that there was a David in some earlier generation, e.g. Judah's grandfather perhaps.
Given names, i.e. forenames, are very important to all Jews - Ashkenazi and Sephardi. The key differentiator comes in the manner in which the forenames are passed on. Ashkenazi Jews regard it as bad luck to give the name of a living relative to a new-born child, whereas Sephardi Jews would name a new-born baby after a living grandparent.
The secular forename Levy/Levi was an alias of Yehuda, as it sounded similar to early forms of the Yiddish word for 'lion'. The patriarch Jacob had likened his son Yehuda to a lion.
This is a fascinating puzzle.
Justin