haudh (“mound, grave, tomb”), in (pl. genitive article), gwanur (pl. “brothers, kinsmen”)
Sindarin
haudh in gwanûr
place name. Grave-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), translated “Grave-mound of the Twins” in notes from 1969 (PE23/140). It is a combination of haudh “mound”, the plural in of the definite article i, and the dual form gwanûr of singular gwanon or gwanunig “twin”.