Herman Zimmerman Raymond was a Human. As the son of Brian Vogt Raymond and Hilary Croener Raymond, he was the great-great-great-great-great-great-great grandchild of Clare and Donald Raymond. His brothers were Andrew, Jeff, and Roger. (TNG-R: "The Neutral Zone", okudagram)
The name of this character was never mentioned in dialog; the name came from the remastered Clare Raymond family tree.
Herman Zimmerman was named for the Art Director and Production Designer Herman Zimmerman