Baruch Leib Rosowsky, was a famous cantor of the Great Choral Synagogue in Riga and a composer of religious music in Riga, at the time a city in Imperial Russia, it is likely that Rosowsky's family is related to the Rasofsky branch of which person who was an American professional boxer, and became a world champion in three weight divisions and was a decorated veteran of World War II?
Baruch Leib Rosowsky:  It is likely that Rosowsky's family is related to the Rasofsky branch of the Barney Ross family. Barney Ross: Barney Ross (born Dov-Ber "Beryl" David Rosofsky; December 23, 1909 – January 17, 1967) was an American professional boxer.
Barney Ross