Procne (Πρόκνη) is the Greek name of the Athenian princess transformed into a swallow (or in some versions, the nightingale) — sister of Philomela. Her tragic story of family vengeance is told in Ovid's Metamorphoses.
Procne and Philomela are inseparable in classical literature.
Procne 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 Procne reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.