Heledd is the heroine of the 9th-century Welsh poem Canu Heledd — the lament of Heledd, princess of Powys, after the death of her brother Cynddylan and the destruction of his hall.
Heledd is rare even in Wales but distinctive.
Heledd 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 Heledd reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.