That's not really the point here: this counting system is what's leftover from various Cumbric (an extinct language related to Welsh) dialects, which is what makes this interesting. Yan = (welsh) un = one; tan = (welsh) dau/dwy = two; tethera = (welsh) tri/tair = three - you can see the influence from pethera for rhyming purposes; pethera = (welsh) pedwar/pedair = four; pimp = (welsh) pum(p) = five, &c.
