Conceptual Development: Beren’s sobriquet “One-handed” dates back to the earliest Lost Tales, but the alternate “Empty-handed” did not appear until Silmarillion drafts from the 1930s. The first version of the name was Ilk. Mablosgen (SM/311), variously revised to Dor. Mablost (LR/405) or N. Camlost (LR/146). All three names appeared in The Etymologies from the 1930s where Tolkien specified their languages as Ilkorin, Doriathrin and Noldorin, respectively (Ety/MAP, KAB, LUS).
In Silmarillion revisions from the 1950s-60s, only S. Camlost appeared, either normally (WJ/51) or in its lenited form Gamlost (WJ/231, 234).