UH-1N's were technically named "Iroquis." No one calls the new upgrades Venoms, except maybe Bell Helicopter, and even they manufacture them with pedals that say BELL on one side and HUEY on the other.
The AH-1Z is technically a Viper, but, again, no one calls them anything but Cobras.
The name Huey comes from a pronunciation of the original designation as HU-1. Even after they changed it to UH-1, the name stuck.
Edit:
And just because it's cool. Here is a Huey blowing some shit up. Attack starts at :59 with the .50cal, then rockets, and GAU-17 on the pulloff.
The AH-1Z is technically a Viper, but, again, no one calls them anything but Cobras.
The name Huey comes from a pronunciation of the original designation as HU-1. Even after they changed it to UH-1, the name stuck.
Edit:
And just because it's cool. Here is a Huey blowing some shit up. Attack starts at :59 with the .50cal, then rockets, and GAU-17 on the pulloff.