Polin means Poland in Hebrew "a good place for the Jews"
I found an excellent article about Jews in Poland at Philly.com: In the two millennia between ancient Israel and its modern rebirth, Jews never enjoyed as much political autonomy as they did in Poland, a land that centuries later would become intrinsically linked to the Holocaust. Polin is Hebrew for Poland and also means "rest here," a reference to a story Jews told themselves about their arrival in Poland in the Middle Ages: that they found favor from the rulers and were allowed to dwell there in tranquility. The result was centuries of a flourishing Yiddish-speaking civilization that made important contributions to Polish and world culture before being nearly wiped out by Nazi Germany. More at Philly.com The history of Jews in Poland on Wikipedia