it's possible that some are from the black rock, or maybe even the originals, but many from the group are not. there are some theories, especially now, that they've been there way back into egyptian times. we also know that richard has recruited a number of them from various regions abroad, like juliet.
tom is from somewhere in the US, the indestructible eyepatch guy was from somewhere in the soviet union, widmore obviously from scottland, ethan and ben were from dharma, etc. they're a nice little UN of hostiles.
