Its honsei (real family name) was Taira at first, and changed to Fujiwara at the time when Hideyoshi was appointed Kanpaku (chief adviser to the Emperor), and then became Toyotomi after bestowed by the emperor.
本姓ははじめ平氏、秀吉の関白就任時には藤原氏となり、その後賜姓を受け豊臣氏となる。