Conversation so far:
What was Warsaw like for E.T.A. Hoffman?
In Warsaw, E.T.A. Hoffmann found the same atmosphere he enjoyed in Berlin, renewing his friendship with Zacharias Werner, and meeting his future biographer, a neighbour jurist called Julius Eduard Itzig.
What was E. T. A. Hoffmann known for in Warsaw?
As chief Prussian administrator of the city from 1795 to 1806, E.T.A. Hoffmann was responsible for assigning surnames to Warsaw's Jewish community—a duty he executed based on whims.
Are there any interesting aspects about E. T. A. Hoffmann's time in Warsaw and assigning surnames to Jewish communities?
The names E.T.A. Hoffmann doled out would apparently depend on the day of the week.

Question: What else did he say
Self-contained rewrite: What did E. T. A. Hoffmann say about the surnames to Jewish communities?