This request is interesting because in Europe we hano no precise idea about the origin othe the mexican Cantu. I am Italian, in Lombardy we consider Cantu a possible variant of Cantù, which is a Lombard surname coming form the town of Cantù, near COMO the city that gives the name to lake Como. This is what says a mexican author. But in fact it is not so sure Other authors say that Cantu comes from a basque surname.
In Lombardy Cantù is a very local surname, Instead Cantu are a large number of people i Mexico or Usa.
The spelling of Joseph... Juseppe makes me suspicious: It could be a wrong spelling o Giuseppe.
Bye for now Giacomo Ganza living at Sondrio By Milano