There is an entry in the GEDCOM database for Marcelo Gandara, b: abt 1790.

He is my 4th Great Grandfather. However I find his entry is incomplete and somewhat incorrect.

Here is the data I've compiled to date:

Marcelo Gutierres de la Gandara, b: abt 1779 Huejucar, Jal.
m: Marie Dominga Vela abt 1799.

son of: Francisco Gutierres de la Gandara y Rita Juliana de Leon.

issue:

Maria Antonia Salome Gandara b: 21 Oct 1800.
Jose Ramon Gandara b: 18 Jul 1802.
Maria Rafaela Gandara b: 24 Oct 1804.
Dona Maria Merse del Refugio Gandara b: Sep 1806 (my 3rd Great Grandmother).
m: Don Francisco Valenzuela abt 1828.
Bernardo Gandara b: Aug 1809.
Jose Antonio Luis Gandara b: Oct 1812.
Jose Vicente Esteban Gandara b: 21 Jul 1815.
Juana Maria de San Pablo Gandara b: 26 Jun 1818.
Maria Ruperta de Jesus Gandara b: 27 Mar 1821.
Maria Anastacia Gandara b: Jan 1824.
Francisco Gandara b: abt Dec 1824.

I believe this makes me related to Joseph de Leon, but I'm not sure how.
E-mails to him are non-deliverable.

Hopefully, this helps someone connecting the line.
Roy