"Strange Fruit" was named Time magazine's Song of the Century (1999). The Cape Jasmine (gardenia) is also a major Atlanta and Charleston, South Carolina garden plant. The Gardenia State is one of South Carolina's nicknames. Gardenia Bardot is a recent name choice in modern celebrity baby naming.
Gardenia 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 Gardenia reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.