Tar-Calion was the Quenya name of Ad. Ar-Pharazôn, the last king of Númenor. This name seems to be a compound of cala “light” and the patronymic suffix -ion “-son” (S/270).
Conceptual Development: This character’s name was first given as ᴹQ. Angor, but the name was quickly changed to ᴹQ. Tar-Kalion (LR/27). In the Addenda and Corrigenda to The Etymologies, there is a name ᴹQ. Tar-kulu that the editors suggested could be an otherwise unattested variant of Tar-Calion (EtyAC/KUL).
A primitive form of this name, ✶Kalajondo, appeared in some linguistic notes from the 1950s (PE21/76).
Calion, Tar-Calion, masc. name, the Quenya name of King Ar-Pharazôn "the Golden". Calion would seem to be connected to cal- "shine", cálë "light". (Silm)