Actually, unlike Baseball, where the pros accept players right out of highschool, the NFL is made-up of about 98% college football players in modern times. The chances of making it to the pros in football is very slim unless you play for a college team. There are some exceptions and most of those players have never become famous or household names.
So, the answer you require would contain a list of thousands of players. Maybe 4,000+ names. Too many to list here.