Beyonce Scares the Crap Out of Etsy ... Don't Screw with My Name!

Beyonce threatened a company that came perilously close to using her name to hawk mugs ... and guess what you can't buy anymore?

Etsy -- a craft website that's a cross between eBay and Pinterest -- was hawking Feyonce mugs. They became a thing ... when someone got engaged lots of people went to the website and bought the happy couple mugs to celebrate the occasion.

The singer felt the pun was more than coincidental -- right down to the accent on the last "e" -- so her lawyers fired off a letter to the company crying foul ... and then threatening them.

Etsy got the message and took the items off the artist's online shop. But all is not well. Etsy still has other feyonce items on its site, including clothing and glassware. And these items are selling big.