Satō (佐藤, characters for "assistance" and "wisteria") is the most common Japanese surname. It may be romanized as Sato or Satoh on a Japanese passport. In wāpuro rōmaji, it is spelled Satou. Sato is also Puerto Rican slang for Street/Stray Dogs and pronounced "saw-toe".
There are several other uses of the word "sato", see below.