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Jacob Seymour Herzbrun from Hungary was the first person to carry the Herzbrun surname according to a family tree put together by Hermaine Cohen in the 1950s. The earliest vital records I've found with the name Herzbrun are from Szepes, Hungary in the 1830s.  

The earliest Herzbrun immigrant to the United States appears to be Herman Herzbrun.  He left Hungary for Dublin, Ireland sometime in the 1860s and arrived at the Port of New York in 1879.  By 1900 there were several Herzbrun families living in the United States.  At that time branches of the Herzbrun family lived in Cleveland, Ohio; Brooklyn, New York; Manhattan, New York; Welch, West Virginia; and San Francisco, California.

By 1920 branches of the Herzbrun family lived in San Francisco, California; Los Angeles, California; Cleveland, Ohio; Brooklyn, New York; Manhattan, New York; Welch, West Virginia and Sewickley, Pennsylvania.

United States immigration records show that one member of the Herzbrun family was able to escape Germany in 1938.  Records at Yad Vashem show that most Herzbrun family remaining in Hungary perished in the Shoah in the 1940s.

There is a Y DNA Project for the Herzbrun surname at Family Tree DNA.  So far males tested from the California and Brooklyn, New York branches show they have a common ancestor.

Family Tree Y DNA Project for the Herzbrun surname