haudh (“mound, grave, tomb”), in (pl. genitive article), gwanur (pl. “brothers, kinsmen”)
Sindarin
haudh in gwanûr
place name. *Burial Mound of the Twins
Haudh in Gwanur
noun. mound of the brothers
Haudh in Gwanur
Haudh in Gwanûr
It has been suggested that Haudh in Gwanûr means "mound of the brothers" in Sindarin, consisting of haudh ("mound, grave, tomb") + in (pl. genitive article) + gwanûr. In editions of The Lord of the Rings prior to the 2004 edition, the circumflex (^) was omitted.
Burial mound of twin brothers (LotR/1054), a combination of haudh “mound”, the plural in of the definite article i and the old dual form gwanûr of gwanunig “twin”.