I had no intention to post in this thread any more-
magar ki karye
Mirza sahib used qadiyani for himself so using it for qadiyanis should be an honour for qadiyanis , like having nisbat of makkiah is always a proud for muslims.thats is why many muslims use makki with their name.
Also calling them mirzais should also be taken as a pride from qadiyanis as this name was given to most pious qadiyanis by hakim nuur uddin sucessor of mirza qadiyani.(reference-kalmatul fasl frombasheer ahmed MA)
I request thread starter to PM his question to me, i may be able to give him a muslim perspective.