Hennes, meaning "for her" in swedish, was the original store. They then bought Mauritz which I believe was specialised in fishing clothes for men. Hennes och Mauritz therefore became a thing and was later shortened to H&M. This is what I remember from a lesson I had five years ago so I can't really give you more info, I hope I at least remembered right
Also yes I do realise you didn't ask for this, just wanted to share
Ah yes, thank you for pointing that out (with regard to spelling)! While you are correct that the company began in Australia, it is now based in the United States.
Also yes I do realise you didn't ask for this, just wanted to share