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I don't know any of these (except GUERRA which I believe means "war"), but check this:

CUELLAR:
Spanish (Cuéllar): habitational name from a place called Cuéllar in Segovia province, or from minor places so named in the provinces of Soria and Salamanca.
http://www.ancestry.com/search/SurnamePage.aspx?sourcecode=13304&html=b&fn=&ln=Cuellar&submit.x=0&submit.y=0

GUERRA:
1. Spanish, Portuguese, and Italian: nickname for a belligerent person or for a soldier, from guerra ‘war’. In some cases the Italian name may represent a short form of various compound personal names containing this element, for example Vinciguèrra. The Iberian name may in some cases reflect a misinterpretation of the Basque base ezquerra, esquerra, from esker ‘left-handed’.
2. Basque: Castilianized form of Basque Gerra, a topographic name for someone who lived in a break or depression in a range of hills, from Basque gerri ‘waist’.
http://www.ancestry.com/search/SurnamePage.aspx?sourcecode=13304&html=b&fn=&ln=Guerra&submit.x=0&submit.y=0

CAVAZOS:
Spanish: from Italian Cavazzo, a derivative of the personal name Iacovo (see James)
http://www.ancestry.com/search/SurnamePage.aspx?sourcecode=13304&html=b&fn=&ln=CAVAZOS&submit.x=0&submit.y=0

VILLAREAL:
Spanish: simplified spelling of Villarreal.
> 1. Spanish: habitational name from any of several places named Villar(r)eal, from Spanish villa ‘(outlying) farmstead’, ‘(dependent) settlement’ + real ‘royal’ (Latin regalis), as for example Villarreal de San Carlos in Cáceres. The places were so named from having some particular connection with the Crown.
2. in some cases, variant of Catalan Vila-real, from the town named Vila-real in Castelló de la Plana provinve.