Spanish:1. habitational name from any of numerous places named Soto or El Soto, from soto ‘grove’, ‘small wood’ (Latin saltus). 2. Castilianized spelling of Asturian-Leonese Sotu , a habitational name from a town so named in Asturies. 3. Castilianized spelling of the Galician equivalent, Souto .
Dictionary of American Family Names © Patrick Hanks 2003, 2006.