surnames

I AM CONFUSED AS TO THE USE OF SURNAMES. I HAVE SOMEONE NAMED GERTRUDIS GONZALES DE PLACENCIA. WHICH NAME IS HER FATHERS AND WHICH NAME IS HER MOTHERS? WHAT DOES "DE" SIGNIFY?

gedcoms

IF I WANT TO UPDATE MY AHNENTAFEL, MAY I ALSO ATTACH AN ALPHABETICAL LISTING OF ALL NAMES I HAVE RESEARCHED WITH DATES AND PARENTS AND SPOUSES, ETC. SO THEY WILL BE AVAILABLE TO OTHER MEMBERS?

TO: Welester Alvarado

Hola Welester!
My name is Amelia Macias. I just joint the NR a few days ago and have very little data to go on in the search for my father's side of the family. My half mom's side is done thanks to my sister (LDS). I'm looking for the Macias and Alavarado families of Jalpa and Aguascalientes. Here is my connection to the Alvarado-Tostado surnames.