Olympia comes from the Greek Olympia — derived from Mount Olympus, the home of the gods. The ancient Olympic Games were held at Olympia in honor of Zeus.
Olympia is rising in the U.S. — Serena Williams's daughter (born 2017) is named Alexis Olympia. The actress Olympia Dukakis (1931-2021) was a famous American bearer.
Olympia 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.
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In Pythagorean numerology the letters of Olympia reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.