In LotR/IV:IV, Frodo is called Daur, which might be the mutated form of this word
Noldorin
tîr
adjective. straight, right, straight, right; [G.] upright, honest; esteem, regard, honour
tîr
adjective. straight, right
tir-
verb. to watch
tiria-
verb. to watch
forgam
adjective. right-handed
âr
noun. king (used of a lord or king of a specified region)
aran
noun. king (used of a lord or king of a specified region)
feir
noun. right (hand)
forn
noun. right, north
fœir
noun. right (hand)
taer
adjective. straight
taer
adjective. straight
taur
noun. king (only used of the legitimate kings of whole tribes)
âr
noun. king
Written tær (with ae-ligature) in the Etymologies, rectified here according to VT/46:18 (which also lists the ligature)