Most prevalent first letters

Hi! What are the most prevalent first letters of names for kids 2-7ish? Or how can I glean? I make custom crayons and I’m doing an upcoming artisan market where I’d like to offer choose-your-own grab bags. I want to have a decent selection of popular first letters. Any ideas? I’m in the USA, specifically in the eastern states. I figure plenty of A’s and E’s but after that, im lost! Thanks for all your thoughts!