Eka is from the Georgian ეკა (Eka) — Georgian diminutive of Ekaterine / Catherine (from Greek Aikaterinē — pure). Eka is one of the Georgian feminine names — central to traditional Georgian Orthodox Christian heritage.
Eka 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 Eka reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.