I went to this page:



http://genealogy.about.com/gi/dynamic/offsite.htm?site=http://www.loc.gov/rr/hispanic/geneal/index%5Fgc.html



and plugged Rey in and found that according to this Heraldry Dictionary
the names were different. Of coure that doesn't mean that one name
didn't evolve into the other or a lot of other possibilities:

Index to the Enciclopedia Heráldica Hispano-Americana of
Alberto and Arturo García Carraffa

The 88 volumes of this work, [Library of Congress Call Number:
CR2142.G3] supplemented by a continuing work, offer an immense tribute
to the work of indefatigable genealogists. The work treats Spanish
heraldry in the first two volumes, and with volume three begins the Diccionario
Heráldico y Genealógico de Apellidos Españoles y Americanos, or
a listing of over 15,000 names with their respective genealogical
histories (with color illustrations of representative crests) of
Spanish and Spanish-American families. Please note that on the spine
one finds two numbers, the Enciclopedia number followed
by the Diccionario number (in other words there is a two
volume difference in numbering).

Originally begun in 1919, its publishing history continued until
1963 when the last volume encompassing the letter "u" was published as
a tribute to her late husband by Margarita Prendes Carraffa. In 1952, a
reprinting of the earlier volumes began. The alphabet covered by the
work goes from "a" through "u".

The structure of the work provides an index in each volume. As the
work progressed, supplemental names were added, breaking the
alphabetical continuum. Without perusing all the volumes one could
never be sure that an article may have been missed. This present
automated index, compiles all the names mentioned in the respective
indices and allows a comprehensive search of all volumes at one time.
One need only enter -- without accents -- the respective surname
(whether it be a compound surname or not) and press "Submit."

Enter
query: 

The resultant list is a finding aid consisting of the names,
volume number of the Enciclopedia, and page number
of more than 15,000 genealogical and coats of arms compiled by the
García-Carraffa brothers. Continued by the work of
href="http://www.loc.gov/cgi-bin/zclient?host=z3950.loc.gov&port=7090&attrset=BIB1&rtype=USMARC&DisplayRecordSyntax=HTML&ESN=F&startrec=1&maxrecords=10&dbname=VOYAGER&srchtype=1,9,2,3,3,1,4,1,5,1,6,1&term_term_1=95184192">Endika
de Mogrobejo (whose contribution is indicated in this index by
volume numbers which are preceded by the letter 'E'), the work of
García Carraffa is a huge single published effort on Hispanic
genealogy. Fortunately, it is available in a variety of libraries in
the United States besides the Library of Congress. The following
locations in the United States report holding this title:

Location

Boston Public Library

California State Library

Getty
Center Library

Harvard University

The Hispanic Society of
America

New York Public Library

Princeton University

University of Illinois

University of Pennsylvania

University of Tennessee

University of California,
Berkeley

University of California,
Berkeley, Bancroft Library

University of California at
Santa Barbara

University of Michigan

University of Nevada (Reno)

State University of New
York at Buffalo

The Library of Congress Call Number (CR2142.G3) will allow the work to
be paged for use within the Library. It is not available for
Interlibrary Loan. Note also that the condition of some volumes may
prohibit their photoreproduction. Further information concerning the
reproduction of articles from this title may
be answered by writing directly to the
href="http://www.loc.gov/preserv/pds/">Photoduplication
Service of the Library of Congress, Washington DC 20540. Additional
reference
work should be continued in consultation with the specialists in the
Local
History & Genealogy Reading Room, or in the Hispanic Reading Room.
We are
unaware of any major translation of this Spanish-language compilation.
Translation
and genealogical research is not available through the offices of the
Library
of
Congress.