I'm not going to rule that out entirely, but just to be certain, there's three points to consider:

1) That is not a Dunmer name in the slightest. Superficial, but still. And the Dark Brotherhood aren't really big on codenames, more on not being discovered. And I cannot work out what race that name is supposed to match. O_o
2) With the year given in the OP and the Skyrim timeline, he would've been all of 9 years old when Skyrim starts. When the Dark Brotherhood was busy dying.
3) Why is a Dark Brotherhood member in Hammerfell and likely to interact with anybody else?