Elektra is from the Greek Ἠλέκτρα (Ēlektra — amber, shining, bright) — from Greek ēlektron (amber/electrum). Elektra is one of the Greek feminine names — central to traditional Greek tragedy heritage. Greek feminine name reflecting Greek tragic heritage.
Elektra 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.
—
In Pythagorean numerology the letters of Elektra reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.