By SI convention, all units named after people are to be spelled with an uppercase first letter,
so Hz, not hz (the unit Hz is named after Heinrich Hertz). Also mHz, kHz, MHz, GHz, *not* mhz, khz, Mhz, GHz but cm, dm, km, ml, etc. Same for e.g. V (Volta), A (Amp¨¨re), Ohm, F (Faraday), H (Henry), B (Bell).
Raymond
