We have no specific dates for Inzilbêth. The dates shown here are those for her husband, Ar-Gimilzôr, whose lifespan would necessarily have been comparable with Inzilbêth's.

The name Inzilbêth apparently combines two Adûnaic words. The first, inzil, is well established as meaning 'flower'. The second, bêth, usually means 'saying' or 'tale', but as part of a name it typically has an 'agental' sense, so here it would mean something like 'speaker' or 'storyteller'. The whole name therefore would mean something like 'flower speaker', though the implications of this name are difficult to interpret. It perhaps relates to Inzilbêth's eldest son Inziladûn (later King Tar-Palantir) whose name meant 'Flower of the West'. Inzilbêth raised him on tales of the Faithful, so perhaps her name is intended as something closer to 'teller of tales to the Flower (of the West)', though here we are clearly straying far into the realms of speculation.

Gimilzagar is the only name we have for Inzilbêth's father. Some sources indicate that this was Gimilzagar the second son of Tar-Calmacil, but that Gimilzagar lived far too early for this to be the case. Alternatively, it might be taken that the father of Inzilbêth was a namesake of his predecessor, and so the name Gimilzagar is shown in the chart above.