Tar-Minastir was the 11th ruler of Númenor, so named “because he built a high tower upon the hill of Oromet” (UT/220). His name might be a compound of a shortened form minas of minassë “tower” and a form of tir- “to watch”.
Minastir
tower-watcher
Minastir masc. name, noun *"Tower-watcher" (Appendix A)
Tar-Minastir was the 11th ruler of Númenor, so named “because he built a high tower upon the hill of Oromet” (UT/220). His name might be a compound of a shortened form minas of minassë “tower” and a form of tir- “to watch”.