A noun appearing as ᴱN. elflin “cygnet” [young swan] in the Early Noldorin Dictionary of the 1920s, a diminutive of ᴱN. alf “swan” (PE13/159); see G. inc “little” (GG/16).

Neo-Sindarin: For purposes of Neo-Sindarin, I’d revise this word using the later diminutive formation ᴺS. alfeg “cygnet, young swan”.