By the time Beyoncé and Jay-Z’s newborn twins Sir and Rumi debuted on Instagram, Beyonce had already applied to trademark their names. But it won’t be an easy process, if it’s anything like the one over the name of Jay and Beyonce’s first child, Blue Ivy.

The June 26 applications seek the exclusive right to use the twins’ names — Sir Carter and Rumi Carter — on everything from baby teething rings to “musical performances” and “computer application software for mobile phones,” according to the applications.

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Unfortunately, that was a problem, where trademarks are concerned. In order to trademark a name, you need to show that you are using it to sell goods, Stanford law professor and trademark expert Mark A. Lemley told TheWrap.

“Presumably the children aren’t themselves products, and aren’t being used as names to sell products,” Lemley said.