Why don't we chant Namu Myoho renge kyo in English?

Namu Myoho renge kyo is the name of the True Dharma. It that sense, it is a personal name. There is no other name for the True Dharma. It is also for this reason that the chanting of the Daimoku is called "invocation'. We invoke the name of the True Dharma. It is an act of petition and there will be no response were we to invoke another name. It is as if we were to call out across a crowded courtyard for our father who we haven't seen for twnety years but we call out another's name. He will never respond.