Not in my opinion.  I've never seen a 529 plan with more than one beneficiary.  You are allowed to change the designated beneficiary though, just have to jump through the right hoops.  Maybe a partial rollover to a different account and then change the beneficiary on that account?  Sounds like it's too late now, but there may still be time for 2021 and beyond.

From section 529 scroll way on down to (e)(3)(A):

https://www.law.cornell.edu/uscode/text/26/529#e_3_A

The term “qualified higher education expenses” means—
(i)tuition, fees, books, supplies, and equipment required for the enrollment or attendance of a designated beneficiary at an eligible educational institution