Hi Dmitry and Jim,
Being a German native speaker, I have tried my best to do research on the term Eisenhauer because it doubtlessly is German.
After leafing thru some 15th and 16th century sources it first seemed to go back to the diggers in the iron mines who dug the iron strands out of the rock. From the 16th century onwards, though, it seems to have been used not only for blade smiths but synonymous of nearly all weapon smiths. By that time, too, it had developed into a common familly name many of which stem from the kind of the former craft of the guy given. Another simlilar name is Eisenmenger (iron mingler), which seems to refer more strictly to the smiths who mixed various sorts of iron in order to get optimum quality steel.
Of course, President Dwight D. Eisenhower had, among others, German ancestors.
I have not been able to trace back the family name Eisenhauer to a manufacturer of blades but in all probability there must have been somebody with that name the quality of whose blades became synonymous of good blades in general and, in consequence, was often copied by other bladesmiths - just like the Passau or Solingen wolf marks.
Hoping to have been helpful,
best,
Michael
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