Corazon is from the Spanish corazón (heart) — a Marian devotional name from Sagrado Corazón de María (Sacred Heart of Mary). Time Person of the Year (1986).
Corazon 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 Corazon reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.