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Last name origins & meanings:

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’.