As Toadfish said Mau is a class act and as Christi said it is his name and he has every right to continue his dream and passion and I wish him only well. I do however wonder if from a business point of view it makes the most sense to carry the same name given the confusion and assumptions that are bound to occur? Not sure what the answer is?
I don't know about the local laws in Mexico, but I am pretty sure that if my last name were McDonald, I could not open a fast food restaurant and call it McDonald's.
In Germany (and other similarly-languaged areas), it is very common to have a local beer named after the city, adding -er to the end of the city. In the later 1800's, and American traveled to Europe to sample the new style of beer (
Pilsner, with the -er ending added to the town that created it) that was all the rage. He liked the version he found in another town (American spelling = Budweis) and brought it to America. He called it by the same name it had in Europe--Budweiser. A few years later the original Budweis brewery went out of business. A few years after that a new brewery took its place and resumed production of the original Budweiser.
About a decade or so ago the American version sued the European version and won. Because its use of the name Budweiser in America predates the
current brewery in the town of Budweis by a couple of years, a brewery in Budweis cannot make a beer called Budweiser. (They called it Budvar instead.)
I am not a lawyer, but it seems to me that if there are two shops with the same name, the first one to exist is the one that gets to use it, unless they did not register the name or unless Mexican law is different.
