Savannah comes from the Spanish sabana, itself from the Taíno (Indigenous Caribbean) word zabana, meaning "treeless plain" — the open grasslands of the New World tropics.
Savannah entered the U.S. Today it sits in the U.S. top 100.
Savannah 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 Savannah reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.