How would you spell this name?

What a Beautiful name. Also the name of the Grandson of Prophet Muhammad, Hussain ibn Ali ibn Abi Talib. Ali ibn Abi Talib was the cousin and son in Law of Prophet Muhammad, who married with the Prophet's daughter, Fatima (sa). However, there are numerous ways to spell Hussein, but the way you spelled it is perfectly fine. But you can also spell it as Hussain or Hussayn and a couple other ways, for instance, Husayn and Husain.