Oh you might be right. The -andy trend still continued in the 80s (even though then
Mandy was mainly short for
Amanda) and at the time not only
Brandon but lots of Br-names became common such as
Brianna,
Brooke and
Brittany. Maybe these two things came together.
Still I don't get it, I mean it's liquor. It might have sounded attractive at the time but it's not only a brand name but really a name for that kind of alcohol. Oh well. :P