Giacomo Rocco was born in Rovinj in 1840. At that time, Rovinj was part of Austria.

Giacomo was also known as

• Jakov Rocco (Croatian name),
• Giacomo Rock (official name in Australia),
• Jacob Rock (Anglicised name) 

Giacomo Rock was born to Andrea Rocco and Vicentia Lorinzette.

Giacomo Rocco is mentioned in the book "Croatians in Australia: Pioneers, Settlers and Their Descendants" By Ilija Šutalo.   ISBN 1-86254-651-7

No arrival date in Australia is known for Giacomo Rocco.   As he was a Mariner (also stevedore, lumper and labourer), the probability is that he jumped ship.

Giacomo Rock married Harriet Hanson, an English immigrant, on 10 Oct 1867 at St James Church, Melbourne, Victoria, Australia.

Giacomo and Harriet had 9 children. They lived in the Melbourne area, unless noted below. Some family added an "e" to Rock to create "Rocke"

1. Louisa Mary Rock (7 Sep 1868 - 21 Mar 1945, unmarried)
2. Ann Rock (3 Oct 1870 - 14 Nov 1955, married Richard Walter Watts)
3. Eliza Rebecca Rock (29 Nov 1872 - 6 Feb 1942, married Thomas Llewelyn Acton)
4. Thomas Dalton Rock (2 Nov 1875 - 17 Jan 1950 died in Western Australia, married Charlotte Maria McKeown)
5. Charles Frederick Dalton Rocke (25 Aug 1878 - died before 1938 in Sth Africa, married and separated from Ruby Frances Stokes)
6. Alice Harriett Rock (26 Aug 1882 - 29 Jun 1890)
7. William John Dalton Rock (17 Jun 1885 - 17 Mar 1949, married Marion Frances Gibson)
   
8. Ethol Vicentia May Rock (20 Feb 1888 - 16 May 1962, married Charles Acton)
9. Florence Elvina Olga Rock (28 Jun 1892 - 11 Jan 1927, married Samuel Ansell)
   

Giacomo Rock died on 27 Sep 1893, due to an accidental fall through a hatchway, falling 25 feet, on board a ship at Williamstown pier.   Newspaper reports named him has "Jacob Brock".

Giacomo Rock is buried at Melbourne General Cemetery in Wesleyan plot I-202, with his wife Harriett and daughters Louisa and Alice.