Q. Tarostar, m. “?King of the Lands”

Given name of the 8th king of Gondor (LotR/1038). This name seems to be a compound of tar¹ “high, king” and the plural form of -sta¹ “land”.

References ✧ LotRI; PMI; UTI

Elements

tar¹ “high; king or queen (in compounds)”
-sta¹ “land, *part” plural