It can't be said that "the word" Mai "is written as Mc". In fact, the word "Mai" was originally translated from the prefix of MC.
generally speaking, you can't choose a name at random. Many people like to choose a favorite word as a name, but when you go abroad, foreigners will be puzzled by such a name, and even some names will make people feel ridiculous.
it's certainly not good to make up your own name like you.