Clytemnestra is from the Greek Klytaimnḗstra (Κλυταιμνήστρα — praiseworthy wooing). Clytemnestra in Greek mythology is the queen of Mycenae, wife of King Agamemnon, mother of Iphigenia, Electra, Orestes, and Chrysothemis, and sister of Helen of Troy + Castor + Pollux (the Dioscuri) — daughter of King Tyndareus of Sparta and Queen Leda. Also central to Sophocles's Electra and Euripides's Electra.
Clytemnestra does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
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In Pythagorean numerology the letters of Clytemnestra reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.