Atossa (c. 550-475 BCE) was the Achaemenid Persian empress — daughter of Cyrus the Great, sister and wife of Cambyses II, wife of Darius the Great, mother of Xerxes I. The most powerful woman of the Persian Empire at its height, she was Darius's chief political adviser. The world's earliest documented case of breast cancer is recorded as occurring to Atossa, treated by the Greek physician Democedes.
Featured in Aeschylus's The Persians.
Atossa 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 Atossa reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.