Briseis (Βρισηίς) is the Trojan War captive whose seizure by Agamemnon sparked Achilles's wrath — the central conflict of Homer's Iliad.
Briseis is rare but rising as Greek myth-revival names gain visibility.
Briseis 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 Briseis reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.