I come across one line in a book:

Whatever we plant in our subconscious mind and nourish with repetition and emotion will one day become a reality.
--Earl Nightinggale

Here, is Earl a name or a title?

I looked up on the web. Some says the person is a host in U.S. and Earl is a name. So is it a first name?

Thanks.

Do inform me if you see any corrections needed in my written English.