1) Russian surname 
[Hasidic dynasty] Kosov is the name of a Hasidic dynasty founded by Rabbi Menachem Mendel Hager of Kosiv, a town in Galicia, presently in Ukraine. The Kosov Hasidic dynasty, Rabbi Mendel of Kosov`s descendants, founded the many Kosov Hasidic sects. The Vizhnitz dynasty is the best known branch of the original Kosover dynasty. Other branches...