Does 'Zermatt', the name of a Swiss town, originate from the name 'Sarmat'? Just asking ...
You also have region Zerbst in eastern Germany. Russian Empress Kathrine the Great was Princess of Anhalt Zerbs and she herself pretty much clarified things by insisting on her Lusatian Serbian (not Sorbian, because Lusatians themselves call Serbs; Sorb itself is foreign given/pronounceable form) origin. So, if we then accept linguistic explanation that Serbian ethnic name actually represent form of original Sarmatian ethnic name, there comes answer on your question.
Just, same as in case with name of Serbs/Sorbe where `Sorbs` represent foreign form because foreigners were unable to pronounce native `Srbi` or `Serbya`, ethnic name of Sarmatians is foreign given form of native Serbian name. Meaning, Serbians are last Slavs who still using once universal name of all Slavs- Sarmatian/Serbian name.
Good news for all Slavs is that states begins to end era of silent ignorance of Slavic antiquity. Officially given statement of Israeli PM Netanyahu about Jewish-Serbian contacts from time of Roman Republic could point solely on Sarmatian-Jewish contacts. So, Polish Sarmatism wasn`t influenced by some Iranians as Anglo-Germanic historical schools want`s to convince us. No, Sarmatism was cultural movement initiated from within because Poles preserved memory on their Sarmatian origin. In other words, if Jews in time of Roman Republic (in time BC) had contact with Serbians (Sarmatians) whom they considered to be natives of their lands, Poles as Sarmatians themselves are also natives to their lands.