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Especially in Northern Ireland, “haych” tends to be used by those from Catholic communities, and “aych” by those from Protestant communities.

A Derry mate of mine confused me no end with an anecdote on Kois (Koi carp I assumed), "No KOIS, where the moilk comes from (bloody English)"

I believe "haitch" is normal in the Republic of Ireland, a shibboleth for Catholicism in Northern Ireland, and common in various odd areas where there's a lot of Irish influence. I'm English but some of my grandparents were Irish Catholics, and I come from Merseyside, where a large proportion of the population has a similar family background, and I say "haitch". But for English-in-England, "aitch" is definitely the more common pronunciation.

“Haych” is common but nonstandard in Britain: https://youtu.be/j4hvh5e8-nw

Haitch is incorrect (in the UK too) but feels more natural as most letter sounds begin with their letters. Aye, bee, cee, dee, etc.

My favorite was when an Aussie asked me if I get Game of Thrones on Haitch Bee Oi up in America.