When I went to a seminar in Germany a few years back, everyone was looking at me a little bit strange because i wore a blue belt, then I noticed that germans had a sistem of white, green, brown (green and brown belts also had 1,2, or 3 brown or black stripes so they had 8kyu ranks before a BB), and black belts, so some of them especially the lower rankes have never seen a blue belt before. So it depends on the organization or school which colors they're gonna have, but the kyu ranks are more or less the same 8 or 10.