In Silmarillion drafts from the 1930s, Dan was the leader of the Danians when they turned back from the March and was the source of their name (LR/175, 215). In The Etymologies, this name was derived from the Danian-only root ᴹ√DAN which Tolkien suggested may be related to ᴹ√NDAN “back” (Ety/DAN). This name sometimes appeared with a long â: Dân (LR/215).
danmasculine name. Dan