Jarrah is from the Australian Aboriginal Noongar language jarrah — the Western Australian eucalyptus tree (Eucalyptus marginata). Jarrah is one of the Australian Aboriginal-language names — central to Noongar cultural heritage of southwestern Western Australia. The jarrah tree is one of the hardwood timber species of Australia + central to Noongar traditional ecological knowledge.
Jarrah 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 Jarrah reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.