Why is Aldi called Aldi? The answer is here (see slide 3) In short, ALDI (which is is a privately owned business that started in Germany in 1948) was founded by two brothers, Karl & Theo Albrecht. The name ALDI comes from the original family named store, Albrecht Discounts.
I notice that the original company was later split into ALDI North (led by Theo) & ALDI South (led by Karl), and that ALDI Australia is part of the ALDI South group.
Sounds a little like the division of the world by Pope Gregory VI in 1493!