Definitions of Hertz:

noun: German physicist who with James Franck proved the existence of the stationary energy states postulated by Bohr (1887-1975)
noun: German physicist who was the first to produce electromagnetic waves artificially (1857-1894)
noun: the unit of frequency; one Hertz has a periodic interval of one second
name: A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #8475)