Porisov is a Hasidic dynasty founded by Rebbe Yehoshua Osher Rabinowicz, son of Rebbe Yaakov Yitzchak Rabinowicz. The current Rebbe of Porisov is Rebbe Akiva Rabinowicz.
Porisov is the Yiddish name of Parysów, a town in present-day Poland.
References
Porisov (Hasidic dynasty) Wikipedia(Text) CC BY-SA