I think that what they asked you for is Mauricio's full name the way that it's used in Spain.

Now we understand that you're helping this Renan person and is fine with me but if you don't provide more detailed information on Mauricio the search will be more difficult.

One more thing. You made it clear that you don't want to use any pay sites and I don't blame you for that since some of these sites could be located who knows where, but how about talking to a local PI in your area and see if they can take your case, they will need a fee and you can negotiate for a final price if they ever contact him.

Good luck.

Tony.