It does. But in truth sometimes it isn't entirely feasible to get such as in your case. But if the one who writes down the name has a good image of the person it's just as effective, not as strong, but it does what it needs to. The seal works in that a person is bound to their name almost like a soul, blood, or psychic bond. People sharing the same names cannot trick it because the spell can differentiate between the two, because the two names are from two entirely different people with entirely different thoughts and souls. The only feasible way I can see getting past it is by changing your name, and not being seen with this different name, or not having one at all. [ He'll be shuffling through the papers in his hands while looking around from his position at the house. ]

As for how the barrier works the way it does...

It was created and designed so that it is connected directly to the one who drew it. So if the creator gets injured the barrier will crumple just a little and in the worst case...completely disappear. [ Such as in death. ] Being able to keep the creators identity a secret is the really reason why it's so powerful. If you can't manage to find them, ah well, you're going to have a rough time getting through, to put it mildly.