Tar-Telperien was the 10th ruler of Númenor and the second ruling queen (LotR/1035, UT/220). The first element of her name is likely to be telpë “silver”. The second element is less clear: it could be a variant of the feminine suffix -ien¹, or some later iteration of ᴹ✶rīʒende “queen = crowned lady” (hat-tip to Vyacheslav Stepanov for the second suggestion).