Sivan (סִיוָן) is the Hebrew name of the third month of the Jewish calendar (May-June) — the month of Shavuot, the giving of the Torah at Sinai. A modern Israeli feminine name.
Sivan is widely used in modern Israel.
Sivan 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 Sivan reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.