Athenais (Ἀθηναΐς) is the Greek name meaning "of Athena." Athenais (c. 401-460 CE) was the Athenian pagan philosopher's daughter who became Byzantine Empress Aelia Eudokia, wife of Theodosius II — a poet and patron of learning, she wrote Greek epic poetry of considerable merit.
Athenais 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 Athenais reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.