Regarding the deity name 'Toyofutsunomitama no Kami,' it is unknown why the word 'Toyo' is attached to the head of the well known name 'Futsunomitama' (the sacred sword given by Amaterasu Omikami [the Sun Goddess] to Emperor Jinmu).
豊布都霊神については布都御魂の名が有名だが、何故「豊」が名前に付くのかは不明。