1-Names that are widely used. You can find a lot of people with the same name.
2-My family name is Sánchez, one of the most common names in Spain.
3-Nowadays, it is impossible to say nothing about the origin, because my amily name is very diffused around the country.
4-I only know that Sánchez derive from Sancho, Sánchez son of Sancho (like the noblema of Don Quijote).
5-Yes, and I have to say that I don´t like it. One example f these names is Johnathan.
6-Normaly only the first nam is used.
7-Normaly we use surnmes without a title, but sometimes we use it as courtesy or respect.
8-Words as cariño (similar to darling) are used.