One thing I just remembered. "Foy" (as in Malfoy) could also be from the Old French word for "faith," so "Malfoy" could also mean "bad faith."
Regardless, it's still a great name for a follower of Voldemort.
I noticed IMMEDIATELY that the cat's name was Mrs. Norris. They have some personality traits in common, do they not?
Great dissection of the words! One of the guys who was at the midnight release pointed out that "Alohamora" is derived from two Italian words, which would probably mean their roots are Latin, but that I'm not too sure about--
port, or variations of such, are more common for the word "door." Now that I think about it, the guy might have just liked hearing his own voice, to which I can relate. I like my voices.
I think it would be great if Rowling included a primer, of sorts, with book 7, explaining the derivation of the various spells and names. Kind of like the appendices of LOTR.