Hello Justin,
In 1851 the Schwabs are at 20 Butler St. Elias is down as Elias Swale, a hawker of cakes and the two daughters are Sophia and Hannah. In the 1861 they've been mistranscribed as Alice and Richard Schwarp! They're in Windsor St, Bishopsgate.
I think the Levys at least were completely secular by the time my father was named. I notice that Abraham Schwab married in church. His only son is Richard.
Rebecca Kroesen, Esther's sister, the one with the enormous family, seems to have some Dutch/German names, but they're all girls except for Samuel, b. 1877.
The two older girls, born in Amsterdam, and Sarah seem to disappear. I can't find marriages or census listings. Schwab is such an easily mistranscribed name I tried just the first names and place of birth, but nothing. Maybe they went back to Holland.
Abraham, Rebecca and Esther all name one of their daughters Sarah in 1884, 1883 and 1891 respectively. Maybe they are named for Sarah Schwarb.
I can't see any other recurring names. I suspect the whole Jewish connection had disappeared fairly quickly in what must have been a harsh life and they were just choosing names they liked the sound of.
Oh, I just saw your next post. Both of their deaths are uncertain. My father says Esther took him to see Gandhi. That would have to have been in 1931. But he also says she died in Quickett St, Bow when he was about 7 which would be 1928/9. I have no idea if that's in Poplar.
I have no idea either about Jacob. My father, remembers him so it's at least three years after 1921 and before Esther went and presumably also in Quickett St. I'll go through all the possible deaths, checking the ages. Maybe only those two will fit.
Pat