Tonantzin is from the Nahuatl to-nan-tzin (our + mother + reverential suffix) — Our Sacred Mother. The Our Lady of Guadalupe (Virgen de Guadalupe) — the great religious-cultural icon of Mexico and Latin America — is widely associated with Tonantzin in Mexican-Catholic syncretism. Tonantzin appears in modern Chicana feminist works by Gloria Anzaldúa and Sandra Cisneros.
Tonantzin 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 Tonantzin reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.