That was already its name. Boeing 737 Max was the programme, with the 373-7, -8 and -9 models, like before 737 NG with -300 and -400 models. It's just that now they're heavily emphasising only on the -7,-8,-9 and skip the "Max" part.
Are/where all the -7, -8, -9's affected by this problem or only specific models?