I am an Olguin. I know much of my family's history. The man I am researching is Bonifacio Olguin who left his wife and two children in Mexico to go work in America, but never returned to them, thus creating another family here while abandoning the other. Very bad indeed. I'm looking for the descedents of his two kids.
I have no idea what their names are.

Try The Surname Navigator click on a country, then type in OLGUIN then press search. It's a very powerful genie search engine. Up to 10 window boxes will open up full of information on all people's with this surname.

EDITOR

The only problem you still might face is the fact that he might not have went by that last name once he came to the US. Most Hispanic family's only use one of the names and in some cases don't really get a choice in the matter. Brothers that I know have different last names because of the person that made their id's. By the way I am also related to Olguin's. Do you know where yours settled?