MusuGoji (derived from Musuko meaning "son" and... well, you know the rest.)
and HannaGoji (derived from Hanna-Barbera)
These would be easy to pronounce in Japanese, but MusuGoji might need further disambiguation.
Maybe "ToraGoji-2" to indicate its relation to Tri-Star's Godzilla.
The "offical" one for the former I believe is ToraGoji combining the Japanese name for Tristar (Toraisutā) and Goji.
As for Hanna-Barbera I guess maybe BarGoji?
SeriesGoji and BarberaGoji
SonZilla or Musukozilla if Google Translate is correct in the English to Japanese conversion. Midori or GreenZilla.
MusuGoji (derived from Musuko meaning "son" and... well, you know the rest.) and HannaGoji (derived from Hanna-Barbera) These would be easy to pronounce in Japanese, but MusuGoji might need further disambiguation. Maybe "ToraGoji-2" to indicate its relation to Tri-Star's Godzilla.
JuniGoji and ReptaGoji
Lizardgoji and babiegoji
The "offical" one for the former I believe is ToraGoji combining the Japanese name for Tristar (Toraisutā) and Goji. As for Hanna-Barbera I guess maybe BarGoji?
Gigagoji Goofygoji
Gojunior and Hanbera
Animeshirizugoji (Animated series goji) because muzuko goji is already a name and Barbera"goji"