Heart is the modern English noun (heart) — used as a Filipino feminine stage name. Debuted at age 13 in G-mik (ABS-CBN, 1999). Films include the Born for You (2017). Over 8 million Instagram followers.
Heart 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 Heart reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.