Erinna (Ἤριννα, 4th c. BCE) was the Greek lyric poet from the Aegean island of Telos — author of the famous lost epic The Distaff (Ἠλακάτη), 300 lines on the death of her childhood friend Baucis.
Allegedly died at nineteen.
Erinna 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 Erinna reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.