The name means "Drû-man". The element Drû is an adaptation of Drughu, which is how that race calls themselves in their language. As the Elves came to know the Drû better, and to recognise their bitter enmity to the Orcs, they acquired the element Edain.
Sindarin
drúadan
proper name. Wose, (lit.) Wild-man
Drúedain
Drúedain
Tawar-in-Drúedain
noun. Tawar-in-Drúedain
forest of wild men; tawar (“great wood, forest”) + in (pl. gen. article) + drú (S adaptation of their native word drughu) + edain (pl. of adan “man”)
tawar-in-drúedain
place name. Drúadan Forest
rhavan
wild man
(?i thravan or ?i ravan – the lenition product of rh is uncertain), pl. rhevain (?idh revain) (WJ:219). Also (of a Drúadan) drû (i dhrû), pl. drúin (in drúin), coll. pl. drúath (UT:385). Also compounded as Drúadan (i Dhrúadan), pl. Drúedain (in Drúedain). Cf. also
The full Sindarin word for “Wose”, a compound of Drû “Wose” and Adan “Man” (PM/324, UT/385), also translated as “Wild Man” (PE17/99, WR/352).
Conceptual Development: In Lord of the Rings drafts from the 1940s, the name N. Druadan appeared with a short u (WR/352). It also had a short u in Tolkien’s Words, Phrases and Passages from the Lord of the Rings (WPP) from the late 1950s or early 1960s (PE17/99), but had a long ú in later writings.