Héloïse is the medieval French form of the Old Germanic Helewidis. Héloïse d'Argenteuil (c. 1100-1164) was the brilliant French scholar and abbess — her tragic love affair with the philosopher Peter Abelard produced one of the most famous correspondences in Western literature.
Héloïse 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 Héloïse reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.