Hello, Robbie. Looking into your query, I think a look at the Rakovnik city and region would be a good idea as I find both surnames Kopriva and Jicinsky immigrating from that area.
For your Joseph Jicinsky immigration, he came over with his parents Franz age 35, Johanna age 35, sister Caroline age 11 (who I believe married a Pavlicek), brother Franz age 9, sister Marie age 7, and brother Carl (Charles) age 1, arriving in New York on June 5, 1867, sailing on board the E. F. Gabain.
On the 1875 New York State Census, this family lives in Brooklyn. Joseph age 22 and is single.
About July 30, 1899 father Franz commits suicide by cutting his throat after a long illness, This from the New York Times, Monday July 31, 1899 page 10, col 7.
Joseph Jicinsky died Thursday Oct 10, 1929, the funeral was held from his home, from the Brooklyn Daily Eagle.
Vera Jicinky marries Cpl. Richard Burnham in Jan. of 1944.
You probably already know that Joseph owned and operated a liquer store. His father Frank was a shoemaker. Alois Kopriva was a miller.
The Jicinsky family lived at 391 Van Brunt St. in Stony Brook. This property was sold to a J. J. Byrne for $3,950.00
There was a death notice of a H. Jicinsky, 391 Van Brunt St, age 65, on Nov 12, 1902.
Alois Kopriva shows up in Stony Brrok in 1892