Amras' father name in Quenya is Pityafinwë, "Little Finwë". His mother name is Ambarussa, "Top-russet", and this refers to his hair. His younger twin Amrod was also called Ambarussa, and they both answered to the name. In Tolkien's late revisions, the name of the elder twin Ambarussa was "Amros" in Sindarin, instead of the older form "Amras". The name of the younger twin, Amrod, was the Sindarin version of "Ambarto".
In the published Silmarillion Amras only appears together with his twin brother Amrod, but in late writings which were left out of the edited Silmarillion by Christopher Tolkien the story of Amrod's death at Losgar appeared. For this reason wherever both Amrod and Amras appear in the published material it should be read as Amras alone.
* The birth order of Fëanor's sons on this tree is based on The Shibboleth of Fëanor, a late note by Tolkien. In The Silmarillion the birth order is: Maedhros, Maglor, Celegorm, Caranthir, Curufin (father of Celebrimbor), Amrod, and Amras.
^Tolkien, J. R. R. (1996), Christopher Tolkien, ed., The Peoples of Middle-earth, Boston: Houghton Mifflin, "The Shibboleth of Fëanor": "It may be mentioned, however, that Sindarin Maedros is explained as containing elements of Nelyafinwe's mother-name Maitimo (Common Eldarin magit-'shapely', Sindarin maed) and of his epesse Russandol (Common Eldarin russa, Sindarin ross); and also that the Sindarin form of Ambarussa (numbered 6, i.e. the elder twin) is here Amros, not Amras., ISBN 0-395-82760-4
^Vinyar Tengwar 41. From the Shibboleth of Fëanor: "Had Amros (2) Ambarto lived, it [i.e. the name Ambarto] would probably have been [Sindarized] as Amrod."