What is tsvi?

Some articles on tsvi:

Kotsk (Hasidic Dynasty) - Lineage
... Morgensztern of Pilov (1840–1905), author of Shloim Yerusholayim, son of Rebbe Dovid Rebbe Tsvi Hersh Morgensztern of Łuków (1858–1920), author of ...
Liske (Hasidic Dynasty) - Rabbi Zvi Hirsh Friedman (Frishman)
... The first Lisker Rebbe, Rabbi Tsvi Hirsh Friedman (Frishman), also known as Hershel Lisker, lived a very frugal life ... He was born Tsvi Hirsh Frishman, but changed his last name to Friedman to avoid being drafted to the army ... The death of Tsvi Hirsh Friedman (Frishman) in 1874 heralded the end of prosperity in the Jewish community of Liske ...
Rapoport-Bick (rabbinic Dynasty) - Lineage of Dynasty
... Tsvi Arieh Rapoport (?-1840) - Married to Faige (Hinde) ... Tsvi Arieh Bick (?-1878) - Married to Fumet Margolioth ... Moshe Tsvi Bick (1911–1990) - carried on the dynasty in New York ...
Mezhbizh (Hasidic Dynasty) - Lineage of The Mezhbizh Dynasty
... Shem Tov (1698-1760) - founder of Hasidism Rabbi Tsvi of Pinsk (died 1780) - (son of the Baal Shem Tov did not serve as an admor) ... Rebbe Aharon of Titiov (died 1800) – son of Rabbi Tsvi ... Rebbe Dov Ber of Ulanov – son of Rabbi Tsvi ...