I made a similar thread ages ago, lol, but can't find it. Was going to link to it A) because it's relevant and B) so I could be lazy and copy paste my own.
Anyway, Skrae originally came from Sara Douglass's Tencendor series. There were creatures called Skraelings which I thought were neat, and back when I played Lineage II, I wanted to use it, but it was taken, so I dropped the "-ling," and I've used it ever since.