Esslingen on Neckar is about eight miles from Stuttgart and only a few miles south of the market town of Heidenheim, home of my Esslingers since at least Hans ESSLINGER born Abt. 1505. I've always assumed the name reflects the German tradition of adding '-er' to show a connection to, in this case, Esslingen. Remember "Ich bin ein Berliner" which John Kennedy declared in a speech in Berlin; he really meant "Ich bin Berliner'. Ein Berliner is a type of sausage, I believe.