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I have never ever heard anyone call them that in the UK, they're either brackets or parenthesis to anyone I've ever spoken to - from scientists, to builders, my grandparents all said brackets (Including the one is almost illiterate)

I'm sure someone must use it but it's not at all common

I picked up "round brackets", "square brackets", "curly brackets" somewhere during my (Lancashire) youth though generally I only use them now when I encounter somebody confused by parens/brackets/braces as terminology.

I say square and curly, but not round - I'm from Devon, but I'm only 19, so I haven't got the accent.

Coincidentally the Dutch word(s) for "brackets" translates to "square parenthesis".

In Turkish, brackets are called "parentheses with corners".

Is the term "parenthetical" not common in the UK?

The alternative would be bracketed, I suppose, so it is common.

Wouldn't it just be "in brackets"?

I used to hear that quite often - not so much in recent years, if I think about it, but that may be by chance. I think it is what I would say.