Spouse of Tar-Ancalimë, the first ruling queen of Númenor (UT/211). His name seems to be a compound of halla “tall” and the suffixal form -car of carma “helm”.
Quenya
Hallacar
tall helmet
hallacar
masculine name. *Tall Helm
Hallacar
Hallacar
Hallacar's name appears to mean "Tall Helmet" in Quenya,[source?] from halla "tall" and car, short from carma, "helmet".
carma
helm
carma (2) noun "helm" (helmet) in Carma-cundo ("k") "Helm-guardian" (PM:260). Notice that in PE17:114, Tolkien indicated that he rather wanted carma to mean "tool" or "weapon", leaving the status of carma "helmet" uncertain. Possibly shortened to -car in the names Eldacar (Elfhelm?), Hallacar (Tall-helm?) Cf. also cassa in Etym.
carma
noun. helm
Hallacar masc. name, apparently "tall helmet": halla + car (cf. Eldacar for the latter element) (UT:210)