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Makes me think of severed heads or limbs, sorry.

I don't see why not in the US, as it's also a surname. There was a minor actor with it: https://en.wikipedia.org/wiki/Severn_Darden - seems to have been in some fun things.

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It's been used here too, a little, but it sounds exactly like seven in English English so I can't see it catching on.

Trey Parker’s (co-creater of South Park) real name is Randolph Severn Parker III. That’s pretty much the first thing that would come to my mind