Eva is the Latinised form of the Hebrew Chavah (חַוָּה) — Eve, the first woman of Genesis, whose name means "life" or "living one." In Greek-speaking Jewish communities the name became Zoe (also "life") — the same meaning translated.
Eva is among the most internationally popular girl's names — high in the rankings in Italy, Spain, France, Russia, Germany, the Netherlands, and Latin America. In the U.S. it sits in the top 90 and is rising.
Eva 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 Eva reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.