I have been researching this family and have discovered the identity of Bernhard Zerkowitz and his brother, Adolph:
LAZAR ZERKOWITZ was b. in Leipnik, Moravia, 20 April 1822, s/o Markus Zerkowitz (b. 1793) and wife, Jachid (Kraus) Zerkowitz.[Witnesses to his birth record were his maternal grandparents, Salomon and Ziperl Kraus.]Lazar remained in Leipnik but frequently traveled out of the country as an "agent".[I have a copy of a passport issued to him in 1870.]He was still alive in December 1881, but I don't know his date of death.
Lazar was married to BETTY WINTER, who was also still alive in December 1881.
1.ADOLPH ZERKOWITZ, b. Leipnik, Moravia, 1848; d. in Vienna, 8 December 1881, age 33 years.Unmarried.His obituary indicates that he was survived by his parents, by his brother, Bernard Zerkowitz, and by two sisters, Ernestine and Katharina.
2.BERNHARD [Bernard] ZERKOWITZ, b. Leipnik, Moravia, 1850; buried in Vienna, 5 March 1940, age 90 years.He m. FLORA SCHLESINGER, b. 1855, buried in Vienna, 31 March 1918, age 63.Seven children:(a) Hugo Zerkowitz, b. Vienna, 26 Dec. 1876; d. Vienna, 30 March 1877; (b) Oskar Zerkowitz, b. Vienna, 1878; (c) Maryon [Marion] Zerkowitz, b. Vienna, 21 July 1882 [m. 1906, Sigmund Grunsberger]; (d) Adolf Zerkowitz, b. Vienna, 9 January 1884; (e) Lina Zerkowitz, b. Vienna, 1885; d. Vienna, 5 Jan. 1887; (f) Gertrude Zerkowitz, b. Vienna, 29 April 1887; d. Vienna, 17 Dec. 1890; and (g) Henriette Zerkowitz, b. Vienna, 14 January 1892.
3.ERNESTINE ZERKOWITZ, b. Leipnik, Moravia; living Dec. 1881.
4.KATHARINA ZERKOWITZ, b. Leipnik, Moravia; living Dec. 1881.
The grandfather of Bernhard Zerkowitz was MARKUS ZERKOWITZ, b. in Mahr. Weisskirchen, Moravia [now Hranice, Czech Republic], 21 January 1793, s/o Michael and Judith (Deutsch?) Zerkowitz.Markus was married in Leipnik on 22 August 1816 to JACHID KRAUS, b. 1795, d/o Salomon and Ziperl Kraus.