S. Lalaith f. “Laughter”
Name of Túrin’s deceased sister, translated “Laughter” (S/198). It is apparently the noun lalaith used as a name.
Conceptual Development: In Silmarillion revisions from the late 1950s, her name was changed to Lalaeth (MR/374), but that was not the name Christopher Tolkien used in the published Silmarillion.
References ✧ MRI/Lalaeth; S/198; SI; UTI; WJI/Urwen