How do you pronounce 'H'?

I’ve noticed that apparently I don’t pronounce the letter H correctly. I know that there are two pronunciations, and I never thought either of them were wrong.

I pronounce H – Haytch, with more of a ‘hay’ or ‘hey’ sound at the start.

Apparently this is incorrect and the proper pronunciation is – Atch, with more of an ‘ay’ sound at the start.

I’m curious, do you think there is a correct pronunciation of the letter H?

How do you pronounce it? Like one of the examples provided, or some totally different magical way?