For your #5, we know that they are ficticious houses. They could just be "Alpha Rho" and "Beta Pi" and that's it.
Say your name was Melissa. You decide you want to be called Mel, so that's what you tell people. You know someone else named Melissa, but she prefers to go by Lissa. There's not necessarily a rhyme or reason why houses shorten their names. Another for instance- my best friend is a Delta Gamma. Well, two names that they go by are DG (Dee Gee) and Delta Gam. There's no formula or anything. Most of the time, it just is.
Oh, and also, what Elephant Walk said.
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"There is only one basic human right, the right to do as you damn well please. And with it comes the only basic human duty, the duty to take the consequences."
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