Her name Neferneferuaten ("Beauty of the Beauties of Aten" or "Most Beautiful One of Aten") is the exact copy of the name Nefertiti took in the 5th regnal year. ("Ta-sherit" simply means "the younger").
The queen's full name, Neferneferuaten ("Beauty of the Beauties of Aten"), was a direct replica of Nefertiti's name during her fifth year as ruler. The term "Ta-sherit" is equivalent to "the younger".