Pertiwi is from the Sanskrit Pṛthvī (पृथ्वी — earth) via the Indonesian Pertiwi — Mother Earth. Ibu Pertiwi (Mother Earth) is the national personification of Indonesia — the equivalent of America's Lady Liberty or India's Bharat Mata. The patriotic song Ibu Pertiwi (c. 1908) is widely considered one of the national songs of Indonesia, sung in schools and government ceremonies since Indonesian independence (1945). In Hindu cosmology, Prithvi is the earth goddess — wife of Dyaus Pita (Sky Father) and mother of Indra.
Pertiwi 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 Pertiwi reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.