Facebook. people you may know.?

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Any and all information they can use to match people to people, they will use. Hometown, school, place of work, birthday, friends, etc. The better question is this: Did you originally have a non-BS account, with your real name? I've done the same thing and I go under a false name with very little info. I get "people you may know" suggestions that are ONLY friends of (very few) friends, primarily because a)I used a different email that has no real name either, and b)I didn't enter personal information on my profile.

Bottom line: FB is getting its information from somewhere, and it's most likely your email address. It can use the name from that and look for people who associate with that name (like old school friends). Either change the email or change the account altogether if you hope to stay completely anonymous.