It is surprising there there are so few Messemers in NYC in 1870 according to the census index.There were at least five male Messemers listed in the 1863 and 1864 City Directories. Some of those Messsemers may have moved to TN during or after 1870.
Messemer, Elise, 68, France, 17th Wd., roll 1000, page 378
Messmer, Charles, 29, Prussia, 17th Wd., roll 997, page 207 Messmer, George, 41, Wald., 17th Wd., roll 998, page 432
Mesmer, Ludwig, 45, France, 20th Wd., roll 1007, page 47 Mesmer, Thomas, 33, Prusia, 18th Wd., roll 1002, page 661