Nippon Ham is one of the biggest food manufacturers in Japan. Pretty much a synonym to the word sausage. One curiosity: Sylvester Stallone had been the main poster boy of the brand in the 80s.

Indeed “Otani” is the most common way to spell it in alphabet even in Japan. If you’re going to spell it exactly as it is spelled in hiragana then it should be Shouhei Ootani. BTW Darvish’s name would be spelled Yuu.