I remember seeing Mahha GoGoGo on TV when I was young. It fascinated me that the characters had round eyes. The stories were silly and innocuous.
The English title was Speed Racer. The Japanese title Mahha GoGoGo comes from Mach Vehicle 5 Go is my guess. The characters first name is Go so it might be part of the title too. The “M” on the helmet is for Mifune Motors. Speed Racer’s Japanese name is Mifune Go.