The name comes from the fournders, the late Albrecht brothers and the German word diskont, discount, Al and di. It is of course a German company, actually two companies, each run by one of the late brothers, Aldi North (nord) which operates as Aldi Markt and Aldi South, or Aldi Süd as it operates.
Most of Europe is Aldi North and most of the English speaking world is Aldi South.
This sign is probably as familiar to you as it is to us and as I said, we saw it all over Europe and England.
However, what is going on in Austria, the place without kangaroos? Hofer? Hofer is used by Aldi South for its stores in Austria and Slovenia only. Very odd and the reason seems to be that Aldi took over a small Austrian based supermarket chain and kept the existing name Hofer, rather than change it to Aldi.