I think we're all neglecting to consider the way that surnames work. The implication of Helion surnames—and, indeed, the surnames of several Bozjan NPCs listed in the field reports—is that multiple queens are still living. This leads me to believe that the actual Queen of Bozja (that is, Gunnhildr) is separate from the concept of personal queens, i.e. the progenitors of individual bloodlines/clans. If all or most female Hrothgar are treated as queens, this makes sense. Radovan would have been in service to a personal queen, rather than to Gunnhildr herself.