Dołęga clan
According to the armorial of Tadeusz Gajl, regarded as the most authoritative to date, no Mazur has ever made it into the ranks of the szlachta (Polish gentry). There were nobles amongst the bearers of the Mazurkiewicz (son of Mazurek) surname, in fact two separate noble lines belonging to the Pobóg and Łabędź clans. Noble bearers of the Mazurkowicz surname had an own-name coat of arms. It showed a key overlaying thee flowers. However, heraldry is being constantly updated thanks to continued research so eventually a well-born Mazur line may be discovered.
Dołęga clan
Here are the surnames whose noble lines belonged to the Dołęga clan. Mazur is conspicuously absent:
M
Macharski, Machciński, Machczyński, Mackun, Makowiecki, Malcewicz, Małkowicz-Sutocki, Marcinowski, Mazierkiewicz, Mazowiecki, Mażejko, Mączyński, Mąkowiecki, Mąstowicz, Mchowski, Mdzewski, Melicz, Melitz, Mellitz, Mikulski, Milcz, Miostowt, Mlicki, Mohylewski, Mohylowski, Mohyłowski, Moniuszko, Monstowicz, Monstwild, Montwid, Montwit, Mostowicz, Mostowski, Mostowt, Moszczeński, Możejko, Mycielski, Myśliborski.