A long weekend of either sleeping on my lap while I play Marvel vs. Capcom 3 or directly preventing me from doing so by stepping on my fightstick has simply exhausted Little-Little.
We know that humans are descendants of the Vrykul, and that the only reason that they're still around are because some babies were sent off to the Eastern Kingdoms as to avoid the whole mass killing of children thing. What I'd like to know, is: who took care of these tiny children? Someone must have, especially if they were weaker and smaller than your average Vrykul. Who manned the boats? More importantly, why is there no evidence of this history in the Eastern Kingdoms?
It's reasonable to assume that there were some vrykul that stayed with the young humans who fled Northrend. If your question is why hasn't anyone found evidence of vrykul living in the Eastern Kingdoms, well, bear in mind that humans are pretty terrible at recording their own history -- to the point that they didn't even know they were descended from vrykul until just now. It honestly just doesn't seem like humans are much concerned about their far-flung history. That's more of a dwarf thing. Humans are firmly rooted in the present.