The Book of Lost Tales was Tolkien's first compilation of the stories that would later comprise The Silmarillion; it can be thought of as a proto-Silmarillion. While certain broad strokes were preserved throughout the development of the legendarium, many linguistic and plot elements of this earliest attempt at mythmaking soon fell by the wayside.
| Lost Tales (Q) | Lost Tales (S) | Silm (Q) | Silm (S) |
|---|---|---|---|
| Tinwë Linto | Tinwelint | Elwë Singollo | Elu Thingol |
| Tindriel/Wendelin | Gwendeling | Melyanna | Melian |
| Inwë | N/A | Ingwë | N/A |
| N/A | Artanor/Eglador | Lestanórë | Doriath |
To showcase Tolkien's etymological growth, here are a few examples of names that he reimagined between the writing of the Lost Tales and his final iterations on The Silmarillion; these are from the two major elvish dialects, Quenya (Q) and Sindarin (S).