An infamous queen of Gondor, spouse of Tarannon (LotR/311, UT/401-2 note #7). The meaning of her name is unclear, but might be a combination of bereth “queen”, rûth “anger” and the feminine suffix -iel (I do not know who first suggested this etymology).
Conceptual Development: In Lord of the Rings drafts from the 1940s, Tolkien used the names Benish Armon >> Tamar >> Margoliantë Beruthiel before settling on simply Beruthiel (WR/454, 464). None of these variants shine any light on the possible meaning of her name.
sintamo noun "smith" (PE17:107-108), cf. more usual variant tamo, q.v.