Are those Japanese restaurants intending to be racist?

I'm a bit concerned about a dish on their menus called nigiri or nigirizushi. Nigiri looks and sounds suspiciously like a racial slur, so before you open up a Japanese restaurant and decide to put nigiri on the menu, think about this: a black person could walk past your establishment and be offended by the mention of nigiri on your menu. The word nigiri might derive from the way the ball of rice has been formed but it could be confused with a racist remark and could cause offence.