Ieva is the Latvian and Lithuanian form of Eve — from the Hebrew Ḥawwāh (life). Ieva Lešinska — Latvian literary translator. Ieva Vaicekauskaitė — Lithuanian classical pianist. Princess Ieva — modern Baltic royal naming.
Ieva 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 Ieva reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.