Hertz是姓還是名？

Hertz can be both first and last name.
If first name use Hertz, means "Brave/Bold"
In here, Heinrich Rudolf Hertz, Hertz should be a last name. Heinrich is first name and Rudolf is middle name.
In United State last name is always at last. And also Hertz is a rental car company in USA.

Hertz is both first and last name

He is of a last name

He first is heinrich

He medium is rudolf

And he last is hertz