Would this be considered a copyright infringement or illegal?

Two examples:

1. I am writing a story and would like to name one of the characters Harry Potter. However, the character has nothing to do with the wizard Harry Potter, nor is the plot anything like the Harry Potter series. In other words, there is little likelihood that any reader with common sense would construe the two as being the same. Am I violating copyright?

What if the story I am writing is realistic fiction? Let’s say I am writing about myself and my name happens to be Harry Potter (it’s not, but let’s suppose), is this copyright infringement?

2. Not sure if this is a copyright question or not, but suppose I write a story about let’s say Harry Sutter and there is actually some guy in my town named that but I don’t know him. Am I violating slander, privacy or other laws?