Sindarin name of Treebeard (LotR/464), more literally translated “beard-(of)-tree” (LotR/1131, PE17/84). His name is a combination of fang “beard” and orn “tree” (SA/orn, PE17/84).
Conceptual Development: In Lord of the Rings drafts from the 1940s, his name also appeared as N. Fangorn “Treebeard” (TI/412).
fang (“beard”) + orn (“tree”)