Nike is a brand name and a person's name. Is this name commonly used? Is it a male name or a female name?

Honestly, not often. I stayed in Canada for about 1 year. Of all the people I met, none was named Nike Adidas. On the contrary, there are quite a few McDonald's.

My personal opinion on whether it is a male name or a female name is very neutral.

But it is indeed the name of the Greek goddess of victory, there is no doubt about it.