I recently came across a German website that goes into nice detail about this name.I'l past the essence of his research, but encourage everyone to go to the website and read the book for themselves.
According to a book written by Horst Machmer in Germany in 1999, the gamily name seems to have originally been MACHMER and they were from the Pfaltz area.In 1784, most of the families left for other places with one line going to Galicia in Poland.Others went to Bosnia, Canada and Wolynia.His history starts 40 years after our family came over the pond.
He goes onto say, "The source for these closely related names is Sprendlingen near Kreuznach in the Palatinate, as will become obvious. The descendants of Meussohr von Mauchenheim, born in 1520 and settled in Sprendlingen, spelled first their name Machenheimer and Macheimer. However, Hans Peter Mauchenheimer/-Machenheimer, born in 1615, is named Machemer in the death certificate, a spelling that was quickly accepted in Sprendlingen. Machmer is present also, but more rarely. At around 1720, the spelling changed to Magemer almost completely, into Magmer sometimes also."
"As of 1760, the spelling of Magemer/Magmer disappears in Sprendlingen completely, and entries in church records show Machemer consistently.
"In contrast, the detour from Magemer to Magmer is not found by the branch in Bosenheim. Here, at about 1700, the name of Macheimer became straight Machemer, without going through other deviations. The situation was different again in Roxheim: there one finds Machemer exclusively during the 18th Century, while today, however, most of the Magmer-families, once from the area around Kreuznach, reside there. The name of Magemer is no longer to be found in Germany.
"At the beginning of the 18th Century already, the more recent spelling of Machmer was in evidence. The oldest finding thereof is an entry into the marriage register of a church in Siegen, dated 1680 (compare to item in the following ChapterÂ6.1).
"The approximately 90 Machmer families still living in the USA today, can be, with two exceptions, traced back to four or five immigrants to Pennsylvania. At least two of them bore, from the very beginning (1744), the name of Machmer. Further details in Chapter 7.
"Obviously only in the USA the nameMachamer is to be find. First it would be thought to be an independent creation, but now the connection to the name Machmer is ensured: Lemuel Machmer, born 1830 in Union County Pennsylvania, progenitor of a larger consanguinity today, had a brother, two years older, who spelled his name Machamer. However for emigrants Machmer it should be possible to find the spelling Machemer, Machimer and Machgamer. An explanation therefor is perhaps, that the voice-modulation of American spoken English tries to avoid a stop in the middle of words; they should flow smoothly. Thus the American Immigrant Officers often have put down the spoken names by addition of a vocal. Moreover it is possible to prove the connection to other spellings, like Maugmer, Maughmer and even Mazmer.
"It can be stated with certainty that, with the exception of the Machmer-branch from the area of Hildesheim, whose origin is not quite clear, and who will be.dealt with at a later point, all the related spellings of Machenheimer, Magenheimer, Macheimer, Machemer, Magemer, Magmer, Machmer, can be traced back to the same source: indeed to Meussohr von Mauchenheim, born in 1520, who settled in Sprendlingen and died there on June 6, 1590."