Mendoza is a Basque surname, also occurring as a place name.
The name Mendoza means "cold mountain", derived from the Basque words mendi (mountain) and (h)otz (cold) + definite article -a (Mendoza being mendi+(h)otza). The original Basque form with an affricate sibilant (/ts/, Basque spelling ⟨tz⟩) evolved in Spanish to the current form.