Also stay in the loop with what's going on through these awesome links:
If you dont add a name to the customer, they sort by customer number. However, its not numerically, its based on first digit.
IE if I sort lowest to highest, I have customer 1, then 10-19, then customer 2, 20-29, 3, 30-39, 4, 5, 6, 7 and 8