Actually I did mean Hapsburg since that was the monarchy that essentially started WW1 and is the monarchy all the leftists worked to overthrow. So it would really get their panties in a bunch to have a new bill named after that monarchy.
But now that you mention it, Hindenburg is probably an even better choice what with him being responsible for giving Hitler all the power and with his name being associated with the Hindenburg disaster.
Why should Germany name their currency after the Austrian house of Habsburg?
The Prussian royalty were of house Hohenzollern