muhammad = 13 + 21 + 1 + 13 + 13 + 1 + 4 = 66
Now can you find a literary or historical reference to the phrase 'your name is mud' prior to 1860?
Your calculation uses just the ranks in the alphabet, like M is the 13th letter, etc. It has no tradition of equalizing things based upon their numerical letter equivalency, which in Hebrew goes back 3000 yrs.
Show me why the same saying is common in German, in fact German immigrants brought it to America, where it was translated into English. There the word for mud = schlamm, but "Sein Namen ist Schlamm" is still said...Was there a Dr. Schlamm that treated Goethe or someone?