I've borrowed this from the English version of the University of Valencia's site, which is not faultless but seems to me to have hit the mark here.

The "baremo de titulados" in Spain is a numerical average degree result out of 4, calculated by awarding 1 for an aprobado, 2 for a notable, 3 for a sobresaliente and 4 for a matrícula de honor, and weighting it by the number of credits. So it's an average which is qualitative (based on grades rather than numerical marks) and weighted (by number of credits). That's why I think Valencia's term is a good one. They use "quantitative weighted average" for the mark out of 10, because it's based on the numerical mark and therefore produces an average out of 10.

Here's the Royal Decree (Real Decreto 1044/2003, de 1 de agosto, por el que se establece el procedimiento para la expedición por las universidades del Suplemento Europeo al Título):

"4.5 Calificación global del titulado:...............................................................................
Nota explicativa: la ponderación de expediente se calcula mediante el criterio siguiente: suma de los créditos superados por el alumno multiplicados cada uno de ellos por el valor de la calificación que corresponda, a partir de la tabla de equivalencias que se especifica a continuación, y dividido por el número de créditos superados por el alumno:
Aprobado: 1 punto.
Notable: 2 puntos.
Sobresaliente: 3 puntos.
Matrícula de Honor: 4 puntos."
https://www.boe.es/buscar/doc.php?id=BOE-A-2003-17310

"En la Universidad española se utiliza el "baremo de titulados", que hace corresponder las calificaciones de 0,1,2,3 ó 4 a: suspenso, aprobado, notable, sobresaliente, matrícula de honor."
https://es.answers.yahoo.com/question/index?qid=200807091520...

"Nota media del expediente (numérica): 9,40
Nota media del expediente (baremo de titulados): 3,10"
http://www.josebarranquero.com/curriculum

"Regarding the grade point average (GPA) of the degree established in Section 4.5 of Annex I of the Royal Decree 1044/2002 (regulator of the Diploma Supplement), the value of the qualification is obtained from the following conversion table: pass = 1 point; merit = 2 points; excellent = 3 points; distinction with honours = 4 points; validated = the points that correspond to the original grade from the previous studies. At the University of Valencia, this average is called qualitative weighted average, (grade point average, or GPA) and is within the range of 1-4."
http://www.uv.es/uvweb/college/en/undergraduate-studies/acad...

Obviously being out of 4 it immediately suggests the US GPA, which is calculated in a comparable way:
http://edglossary.org/grade-point-average/

However, I wouldn't simply call it that, because it's not identical, and it might create the impression that the American system has been used directly, which is not the case.

--------------------------------------------------
Note added at 2 hrs (2017-05-04 16:50:23 GMT)
--------------------------------------------------

As so often happens, numerical levels of marks in different countries don't match. The person whose CV is cited above has a numerical average of 9.4, which is exceptionally high, really excellent, only just shy of matrícula de honor level. But his "baremo de titulados" of 3.1 would give quite that impression if taken as a GPA: in the US, a GPA of 3.1 is pretty good but not great. It would him a disservice to indicate that 3.1 is his "GPA", especially if he wants to study in the US afterwards.

In fact I would be inclined to remove "equivalent to GPA" and put "out of 4" instead.

--------------------------------------------------
Note added at 2 hrs (2017-05-04 16:51:24 GMT)
--------------------------------------------------

Sorry: I meant "wouldn't give quite that impression" in lines 3-4 of the added note-

--------------------------------------------------
Note added at 3 hrs (2017-05-04 17:34:48 GMT)
--------------------------------------------------

If you think about it, it's pretty obvious why "baremos de titulados" are lower than GPAs. In order to get a "baremo" over 3, you've got to get at least one matrícula de honor and nothing below a sobresaliente. To get 3.5 you've got to get half sobresaliente and half matrícula de honor. How often does that happen?