[Kevin]

As for the nicknames, see above.

As for why the chapters are called what they are, well here's why:

For my organization, we actually started out (in the 1870's) calling our chapters by Roman Numerals. I think our Delta Chapter was once Chapter X -- I think I read that.. anyway... at that time, many fraternities were really starting to branch out and go national. So, we decided to adopt the Greek Letter identification of chatpers (with a few modifiers I won't get into).

Basically, your original chapter is your "Alpha" chapter. Your 2nd is Beta, 3rd is Gamma and so on. Once you get to the end of the alphabet, you have an Alpha Alpha, then Alpha Beta, then Alpha Gamma.. all the way to the end of that alphabet, then Beta Alpha (and so on).

Make sense?