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1.
MHz
Pronunciated: "Megahertz" not "M.H.Z."

Megahertz means 1000 kilohertz (kHz) and kilohertz means 1000 Hz (cycles per second)

1 MHz = 1000 kHz = 1,000,000 Hz
Wow, sense I listen to DC101, who has a transmitter on 101.1 MHz, thats 101,100 kHz, which is 101,100,000 Hz (cycles per second)
by IrishRepublicanArmy December 21, 2003
 
2.
MHz
MHz aka M.Hz is a rapper name which stands for Muhammad Hassan Zia.
M.Hz Production

M.Hz Production

MHz The Rapper
by M.Hz August 21, 2011