I apologize for the delay in my response. I was in the process of moving when you sent this posting to the message board...and then time slipped by...my complete apologies.
Yes, I believe we are connected. However, I do not have your exact names in my database. I will be contacting the other Meng researchers to see if they have connected the Illinois Mengs with our Ohio branch.
The Mengs were mostly masons (and other building specialist) who traveled the world building churches. So we have found they in several places in the US - including NY, Ohio, Illinois, Kansas and other places. As well we have found the Meng's and the other associated names (MANG, MANGE, MANGES, MENGE, MENGES) in Brazil, Switzerland, Alsace France (where we believe they most recently originated) and many other places.
They also seemed to travel with other families of the similiar names such as GERBER, SCHNEIDER, HEITZ, CASPAR, and surprisingly I see your VOLMER is also in our Ohio line : a Mary Margaret Vollmer b. July 24, 1874 d. November 12, 1915 .
I will be in contact with you. If you would email me at firstname.lastname@example.org with your email address that would be great.