Olivier is from the Japanese manga — adapted from the French masculine Olivier as a feminine military name. General Olivier Mira Armstrong is a character in Fullmetal Alchemist (2001-2010) and Brotherhood (2009-2010) by Hiromu Arakawa. Olivier is commanding officer of Briggs Fortress (the Amestrian fortress at the Drachma border), head of the Armstrong noble family, and older sister of State Alchemist Alex Louis Armstrong.
Olivier 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 Olivier reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.