Redheads of Middle-Earth

[Maerbenn]

From HoMe XII: The Peoples of Middle-earth; The Shibboleth of Fëanor; ‘The names of the Sons of Fëanor with the legend of the fate of Amrod’:

(1) Maitimo 'well-shaped one': he was of beautiful bodily form. But he, and the youngest, inherited the rare red-brown hair of Nerdanel's kin.
…
(6) Ambarto
(7) Ambarussa
These two names of [the] twins (i-Wenyn) were evidently meant to begin similarly. Ambarussa 'top-russet' must have referred to hair: the first and last of Nerdanel's children had the reddish hair of her kin. Around the name Ambarto [> Umbarto] - which one might expect to begin with an element of the same sense as (7) - much legend and discussion gathered. The most authentic seems to be thus:
The two twins were both red-haired. …