Uhmm interesting topic and question. Well to fully answer the question I guess I will have to mention the past of my family.
My family or rather the blodline of my family goes way back to the old royalties of the nation. Unfortunatly we ( they ) lost the battle for Wassenaar ( a town in Holland ) and thereby losing territory to the enemy which caused my family to lose the war, and thus the thrown. This all took place in the 13th century ( which nowadays has little to no meaning ) although it might have turned out differently in Holland if the bloodline would have remained to be the royal bloodline. So in a way to remember my herritage and the casualties in that battle I named myself The_Dutch_Prince ( seeing I always found it to be my birthright tosit onthe thrown ).
As formy other nicknames ( Milliardo ) iscomes from Gundam Wing ( MilliardoPeacecraft/Zechs Marquise ). The characteristics of that character as just spot on I would say. Honorful, respectful, intelligent, the perfect soldier ( following orders when perceived as being right and justified but being denied when they are perceived as being wrong ). What more can I wish for.