If you only have the deceased person's name and no other information, the best place to find their obituary will be by searching their name in online databases like Legacy.com or Newspaper.com.
If you don't get anywhere with that, I think you're going to have a tough time finding much with a name alone. You should consider trying as hard as possible to find more information as set out in our preliminary step on this page and then using that information to search other resources I've shared above.