Themisto (Θεμιστώ) is from the Greek themis (divine law, right) — "right-doing." The third wife of King Athamas of Boeotia, who in jealousy tried to kill her stepchildren but mistakenly killed her own — one of the most tragic figures of Greek myth.
Featured in Euripides' lost Ino.
Themisto reduces to five — the number of Greek right-doing.