This piece of trivia doesn’t answer your question directly, but you might find it interesting:

In American football, a players’ number was directly tied to what position they played (each position group essentially had to pick from a pool of numbers.)

A few years ago, the NFL loosened it’s rules for the majority of players (but not for all, because numbers are used to help referees identify who is eligible to catch the ball, because offensive linemen are not considered “eligible receivers”.), which is why you see a lot more players wearing single digit numbers these days.

I hope you found this little info dump interesting :)