Mahadevi is from the Sanskrit Mahādevī. A modern American baby name in the broader Sanskrit heritage aesthetic. Mahadevi is a foundational name with deep heritage. Sanskrit Mahādevī great-Devi supreme-Goddess + Sanskrit mahā great + devī goddess + foundational central Mahādevī foundational-central-supreme-Devi in-Shakta-tradition + foundational central Devi-Mahatmya 700-verses Durgā-Saptaśatī in Markandeya Purana Chapters 81-93 foundational-central-Devi-Purana + foundational central Mahādēviyakka 1130-1160 CE Kannada-Virashaiva-Bhakti-poet foundational-central-female-Lingayat-saint composed 350-Vachanas devoted-to-Cennamallikārjuna + foundational central Mahādevī one of Aṣṭādaśa-Śakti-Pīṭha eighteen-Shakti-Pithas + foundational central Mahā-Devī-Bhāgavata 12-cantos 18000-verses foundational-central-Devi-Purana rival-to-Bhagavata-Purana + foundational central Mahā-Kālī + Mahā-Lakṣmī + Mahā-Sarasvatī three-Mahā-Devis foundational-central-Devi-triad + foundational central in Bhagavad Gita 10:34 kīrtiḥ śrīr vāk ca nārīṇāṃ smṛtir medhā dhṛtiḥ kṣamā + foundational central Śrī-Sūkta Rigveda-Khila-Sūkta 15-verses + foundational pan-Shakta heritage. Foundational Sanskrit feminine name reflecting cultural + historical heritage spanning centuries.
Mahadevi 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 Mahadevi reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.