Looking closely at the small image of the family crest that is included with my mother's Ahnenpass book, I noticed this alternate spelling. Amazing. I have looked at this image dozens of times and until I was able to blow it up I never noticed this alternative spelling.
Now, it may be nothing, but I am off to search for any ELTCHNER I can find.

Other spellings for this surname include, ELSCHNER (most used), ELTZSCHNER (the 'TZ' dropped around 1780-90 when the children of Johann Joseph Eltzschner are found listed as Elschner), Oelschner which appears to predate any findings I have, and now ELTCHNER which is from the days of our early ancestors during the time when the family coat of arms was bestowed.

Wish me luck. I hope this information helps some other researcher.